2018 United States Senate elections

2018 United States Senate elections

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35 of the 100 seats in the United States Senate 51 seats needed for a majority
Majority party Minority party   Leader Mitch McConnell Chuck Schumer Party Republican Democratic Leader since January 3, 2007 January 3, 2017 Leader's seat Kentucky New York Seats before 51 47 Seats after 53 45 Seat change 2 2 Popular vote 34,687,875 52,224,867[a][b] Percentage 38.7% 58.2% Seats up 9 24 Races won 11 22   Third party   Party Independent Seats before 2[c] Seats after 2 Seat change Popular vote 808,370[d] Percentage .9% Seats up 2 Races won 2
Results of the elections:      Democratic gain      Republican gain      Democratic hold      Republican hold      Independent hold      No election Rectangular inset (Minn. & Miss.): both seats up for election
Majority Leader before election Mitch McConnell Republican Elected Majority Leader Mitch McConnell Republican

The 2018 United States Senate elections were held on November 6, 2018. Among the 100 seats, the 33 of Class 1 were contested in regular elections while 2 others were contested in special elections due to Senate vacancies in Minnesota and Mississippi. The regular election winners were elected to 6-year terms running from January 3, 2019, to January 3, 2025. Senate Democrats had 26 seats up for election (including the seats of 2 Independents who caucus with them), while Senate Republicans had 9 seats up for election.

To maintain their working majority of 50 senators and their party's vice president's tie-breaking vote, Republicans could only afford a net loss of 1 seat in these elections. The Republicans had a 52–48 majority after the 2016 elections, but they lost a seat in Alabama after Jeff Sessions resigned to become U.S. attorney general and Doug Jones, a Democrat, won in the subsequent special election. 3 Republican-held seats were open as a result of retirements in Tennessee, Utah, and Arizona. Although every Democratic incumbent ran for re-election, Democrats faced an extremely unfavorable map, defending 26 seats, of which 10 were in states won by Donald Trump in the 2016 presidential election, and 5 of those where Trump had won by more than 10%. Republicans, however, only had to defend 9 seats, of which only 1 was in a state won by Hillary Clinton in 2016.

The Republicans increased their majority by defeating Democratic incumbents in Florida, Indiana, Missouri, and North Dakota, and holding the open seats in Tennessee and Utah. Democrats won 2 Republican-held seats, defeating an incumbent in Nevada and winning the open seat in Arizona. This was the first time Republicans gained Class 1 Senate seats since 1994.

The results for this election cycle were the only significant gains made by the Republicans in what was otherwise characterized as a "blue wave" election. The Republican gains in the Senate and the Democratic gains in the House marked the first midterm election cycle since 1970 in which the president's party made net gains in one chamber of Congress while suffering net losses in the other,^[3] which also occurred in 1914, 1962, and 2022. This was also the first midterm election cycle since 2002 in which any incumbents of the non-presidential party lost re-election. The number of defeated non-presidential party incumbents (4) was the most since the 1934 mid-terms.^[4] To date, this remains the last time that Democrats won a Senate election in Montana, Ohio, and West Virginia.

Among the 33 Class 1 Senate seats up for regular election in 2018, twenty-three were held by Democrats, two by independents who caucused with the Senate Democrats and eight by Republicans. Class Two seats in Minnesota and Mississippi held by interim appointees were also up for election; both incumbent appointees sought election to finish their unexpired terms.

Democrats targeted Republican-held Senate seats in Arizona (open seat) and Nevada.^[5] Seats in Texas,^[6] Mississippi (at least one of the two seats) and Tennessee (open seat)^[7] were also competitive for the Democrats. Republicans targeted Democratic-held seats in Indiana, Missouri, Montana, North Dakota and West Virginia, all of which were won by Republicans in both the 2012 and 2016 presidential elections.^[8] Seats in Florida, Ohio, Pennsylvania, Wisconsin and Michigan, all of which were won by Obama in 2008 and 2012 but by Trump in 2016, were also targeted by Republicans.^[5][9] The Democratic-held seat in New Jersey was also considered unexpectedly competitive due to corruption allegations surrounding the Democratic incumbent.

The map was widely characterized as extremely unfavorable to Democrats, as Democrats were defending 26 states while Republicans were defending nine. Of these seats, Democrats were defending ten in states won by Donald Trump in the 2016 presidential election, while Republicans were only defending one seat in a state won by Hillary Clinton in 2016.^[10][11][12] According to FiveThirtyEight, Democrats faced the most unfavorable Senate map in 2018 that any party has ever faced in any election.^[13][14]

Parties									Total
			Democratic	Republican	Independent	Libertarian	Green	Other
Last elections (2016)			46	52	2	0	0	0	100
Before these elections			47	51	2	0	0	0	100
Not up			23	42	0	—	—	—	65
	Class 2 (2014→2020)		11	20	0	—	—	—	31
	Class 3 (2016→2022)		12	22	0	—	—	—	34
Up			24	9	2	—	—	—	35
	Class 1 (2012→2018)		23	8	2	—	—	—	33
	Special: Class 2		1	1	0	—	—	—	2
	Regular elections
	Incumbent retired		0	3	0	—	—	—	3
		Held by same party	—	2	—	—	—	—	2
		Replaced by other party	1 Republican replaced by 1 Democrat						1
		Result	1	2	0	0	0	0	3
	Incumbent ran		23	5	2	—	—	—	30
		Won re-election	19	4	2	—	—	—	25
		Lost re-election	1 Republican replaced by 1 Democrat 4 Democrats replaced by 4 Republicans						5
		Result	20	8	2	0	0	0	30
	Special elections
	Appointee ran		1	1	—	—	—	—	2
		Appointee elected	1	1	—	—	—	—	2
		Result	1	1	0	0	0	0	2
	Total elected		22	11	2	0	0	0	35
	Net gain/loss		2	2					2
	Nationwide vote		52,224,867	34,722,926	808,370	590,051	200,599	1,262,765	90,473,222
		Share	58.17%	38.67%	0.90%	0.66%	0.22%	1.41%	100%
Result			45	53	2	0	0	0	100

Source: Clerk of the U.S. House of Representatives.^[1]

Each block represents one of the one hundred seats in the Senate. "D#" is a Democratic senator, "I#" is an independent senator and "R#" is a Republican senator. Arranged so parties are separated and a majority is clear by crossing the middle.

Each block indicates an incumbent senator's actions going into the election. Some "Ran" for re-election, some "Retired," and those without a note were not up for election this cycle. Before the elections, Republicans held 51 seats, Democrats held 47, and Independents held 2.

After the 2017 Senate special election in Alabama on the start of the second session in the 115th Congress.

D1 Ala. Gain	D2	D3	D4	D5	D6	D7	D8	D9	D10
D20	D19	D18	D17	D16	D15	D14	D13	D12	D11
D21	D22	D23	D24 Calif. Ran	D25 Conn. Ran	D26 Del. Ran	D27 Fla. Ran	D28 Hawaii Ran	D29 Ind. Ran	D30 Md. Ran
D40 N.D. Ran	D39 N.Y. Ran	D38 N.M. Ran	D37 N.J. Ran	D36 Mont. Ran	D35 Mo. Ran	D34 Minn. (sp) Ran	D33 Minn. (reg) Ran	D32 Mich. Ran	D31 Mass. Ran
D41 Ohio Ran	D42 Penn. Ran	D43 R.I. Ran	D44 Va. Ran	D45 Wash. Ran	D46 W.Va. Ran	D47 Wis. Ran	I1 Maine Ran	I2 Vt. Ran	R51 Wyo. Ran
Majority →
R41	R42	R43 Ariz. Retired	R44 Miss. (reg) Ran	R45 Miss. (sp) Ran	R46 Neb. Ran	R47 Nev. Ran	R48 Tenn. Retired	R49 Texas Ran	R50 Utah Retired
R40	R39	R38	R37	R36	R35	R34	R33	R32	R31
R21	R22	R23	R24	R25	R26	R27	R28	R29	R30
R20	R19	R18	R17	R16	R15	R14	R13	R12	R11
R1	R2	R3	R4	R5	R6	R7	R8	R9	R10

Some senators were "Re-elected," some were a "Gain" in the seat from the other party (either by beating an incumbent or by winning an open seat), some were a "Hold" by the same party but with a different senator, and those without a note were not up for election this year.

After these elections, Democrats had 45 seats, independents had 2, and Republicans had 53.

D1	D2	D3	D4	D5	D6	D7	D8	D9	D10
D20	D19	D18	D17	D16	D15	D14	D13	D12	D11
D21	D22	D23	D24 Calif. Re-elected	D25 Conn. Re-elected	D26 Del. Re-elected	D27 Hawaii Re-elected	D28 Md. Re-elected	D29 Mass. Re-elected	D30 Mich. Re-elected
D40 Va. Re-elected	D39 R.I. Re-elected	D38 Pa. Re-elected	D37 Ohio Re-elected	D36 N.Y. Re-elected	D35 N.M. Re-elected	D34 N.J. Re-elected	D33 Mont. Re-elected	D32 Minn. (sp) Elected[e]	D31 Minn. (reg) Re-elected
D41 Wash. Re-elected	D42 W.Va. Re-elected	D43 Wis. Re-elected	D44 Ariz. Gain	D45 Nev. Gain	I1 Maine Re-elected	I2 Vt. Re-elected	R53 N.D. Gain	R52 Mo. Gain	R51 Ind. Gain
Majority →
R41	R42	R43 Miss. (reg) Re-elected	R44 Miss. (sp) Elected[e]	R45 Neb. Re-elected	R46 Tenn. Hold	R47 Tex. Re-elected	R48 Utah Hold	R49 Wyo. Re-elected	R50 Fla. Gain
R40	R39	R38	R37	R36	R35	R34	R33	R32	R31
R21	R22	R23	R24	R25	R26	R27	R28	R29	R30
R20	R19	R18	R17	R16	R15	R14	R13	R12	R11
R1	R2	R3	R4	R5	R6	R7	R8	R9	R10

Key:	D# Democratic R# Republican I# Independent, caucusing with Democrats

Several sites and individuals publish predictions of competitive seats. These predictions look at factors such as the strength of the incumbent (if the incumbent is running for re-election) and the other candidates, and the state's partisan lean (reflected in part by the state's Cook Partisan Voting Index rating). The predictions assign ratings to each seat, indicating the predicted advantage that a party has in winning that seat.

Most election predictors used:

• "tossup": no advantage
• "tilt" (used by some predictors): advantage that is not quite as strong as "lean"
• "lean": slight advantage
• "likely" or "favored": significant, but surmountable, advantage
• "safe" or "solid": near-certain chance of victory

Constituency		Incumbent		2018 election ratings
State	PVI[15]	Senator	Last election[f]	Cook Oct 26, 2018[16]	IE Nov 1, 2018[17]	Sabato Nov 5, 2018[18]	NYT Nov 5, 2018[19]	Fox News[g] Nov 5, 2018[20]	CNN Nov 2, 2018[21]	RCP Nov 5, 2018[22]	Daily Kos Nov 5, 2018[23]	Politico Nov 5, 2018[24]	538[h] Nov 6, 2018[25]	Result
Arizona	R+5	Jeff Flake (retiring)	49.2% R	Tossup	Tilt D (flip)	Lean D (flip)	Tossup	Tossup	Tossup	Tossup	Tossup	Tossup	Lean D (flip)	Sinema 50.0% D (flip)
California	D+12	Dianne Feinstein	62.5% D	Safe D	Safe D	Safe D	Safe D	Likely D	Safe D	Safe D	Safe D	Safe D	Safe D	Feinstein 54.2% D
Connecticut	D+6	Chris Murphy	54.8% D	Safe D	Safe D	Safe D	Safe D	Likely D	Safe D	Safe D	Safe D	Safe D	Safe D	Murphy 59.5% D
Delaware	D+6	Tom Carper	66.4% D	Safe D	Safe D	Safe D	Safe D	Likely D	Safe D	Safe D	Safe D	Safe D	Safe D	Carper 60.0% D
Florida	R+2	Bill Nelson	55.2% D	Tossup	Tilt D	Lean D	Tossup	Tossup	Tossup	Tossup	Tossup	Tossup	Lean D	Scott 50.1% R (flip)
Hawaii	D+18	Mazie Hirono	62.6% D	Safe D	Safe D	Safe D	Safe D	Likely D	Safe D	Safe D	Safe D	Safe D	Safe D	Hirono 71.2% D
Indiana	R+9	Joe Donnelly	50.0% D	Tossup	Tossup	Lean R (flip)	Tossup	Tossup	Tossup	Tossup	Tossup	Tossup	Lean D	Braun 50.7% R (flip)
Maine	D+3	Angus King	52.9% I	Safe I	Safe I	Safe I	Safe I	Likely I	Safe I	Safe I	Safe I	Safe I	Safe I	King 54.3% I
Maryland	D+12	Ben Cardin	56.0% D	Safe D	Safe D	Safe D	Safe D	Likely D	Safe D	Safe D	Safe D	Safe D	Safe D	Cardin 64.9% D
Massachusetts	D+12	Elizabeth Warren	53.7% D	Safe D	Safe D	Safe D	Safe D	Likely D	Safe D	Safe D	Safe D	Safe D	Safe D	Warren 60.3% D
Michigan	D+1	Debbie Stabenow	58.8% D	Likely D	Safe D	Safe D	Likely D	Likely D	Likely D	Lean D	Safe D	Likely D	Safe D	Stabenow 52.3% D
Minnesota (regular)	D+1	Amy Klobuchar	65.2% D	Safe D	Safe D	Safe D	Safe D	Likely D	Safe D	Safe D	Safe D	Safe D	Safe D	Klobuchar 60.3% D
Minnesota (special)	D+1	Tina Smith	Appointed (2018)[i]	Lean D	Likely D	Likely D	Lean D	Likely D	Likely D	Lean D	Likely D	Likely D	Likely D	Smith 53.0% D
Mississippi (regular)	R+9	Roger Wicker	57.1% R	Safe R	Safe R	Safe R	Safe R	Likely R	Safe R	Safe R	Safe R	Safe R	Safe R	Wicker 58.5% R
Mississippi (special)[j]	R+9	Cindy Hyde-Smith	Appointed (2018)[k]	Lean R	Safe R	Likely R	Lean R	Lean R	Safe R	Likely R	Likely R	Likely R	Lean R	Hyde-Smith 53.6% R
Missouri	R+9	Claire McCaskill	54.8% D	Tossup	Tilt R (flip)	Lean R (flip)	Tossup	Tossup	Tossup	Tossup	Tossup	Tossup	Tossup	Hawley 51.4% R (flip)
Montana	R+11	Jon Tester	48.6% D	Tossup	Tilt D	Lean D	Tossup	Lean D	Lean D	Tossup	Tossup	Lean D	Likely D	Tester 50.3% D
Nebraska	R+14	Deb Fischer	57.8% R	Safe R	Safe R	Safe R	Safe R	Likely R	Safe R	Safe R	Safe R	Safe R	Safe R	Fischer 57.7% R
Nevada	D+1	Dean Heller	45.9% R	Tossup	Tilt D (flip)	Lean D (flip)	Tossup	Tossup	Tossup	Tossup	Tossup	Tossup	Tossup	Rosen 50.4% D (flip)
New Jersey	D+7	Bob Menendez	58.9% D	Tossup	Likely D	Likely D	Tossup	Lean D	Lean D	Lean D	Lean D	Lean D	Likely D	Menendez 54.0% D
New Mexico	D+3	Martin Heinrich	51.0% D	Safe D	Safe D	Safe D	Safe D	Likely D	Safe D	Safe D	Safe D	Safe D	Safe D	Heinrich 54.1% D
New York	D+11	Kirsten Gillibrand	72.2% D	Safe D	Safe D	Safe D	Safe D	Likely D	Safe D	Safe D	Safe D	Safe D	Safe D	Gillibrand 67.0% D
North Dakota	R+16	Heidi Heitkamp	50.2% D	Lean R (flip)	Lean R (flip)	Lean R (flip)	Lean R (flip)	Likely R (flip)	Lean R (flip)	Lean R (flip)	Lean R (flip)	Lean R (flip)	Lean R (flip)	Cramer 55.4% R (flip)
Ohio	R+3	Sherrod Brown	50.7% D	Likely D	Safe D	Likely D	Likely D	Likely D	Likely D	Lean D	Likely D	Likely D	Safe D	Brown 53.4% D
Pennsylvania	EVEN	Bob Casey Jr.	53.7% D	Likely D	Safe D	Safe D	Likely D	Likely D	Likely D	Likely D	Safe D	Likely D	Safe D	Casey 55.7% D
Rhode Island	D+10	Sheldon Whitehouse	64.8% D	Safe D	Safe D	Safe D	Safe D	Likely D	Safe D	Safe D	Safe D	Safe D	Safe D	Whitehouse 61.5% D
Tennessee	R+14	Bob Corker (retiring)	64.9% R	Tossup	Lean R	Lean R	Tossup	Lean R	Tossup	Tossup	Lean R	Lean R	Likely R	Blackburn 54.7% R
Texas	R+8	Ted Cruz	56.5% R	Tossup	Likely R	Lean R	Tossup	Lean R	Lean R	Lean R	Lean R	Lean R	Likely R	Cruz 50.9% R
Utah	R+20	Orrin Hatch (retiring)	65.3% R	Safe R	Safe R	Safe R	Safe R	Likely R	Safe R	Safe R	Safe R	Safe R	Safe R	Romney 62.6% R
Vermont	D+15	Bernie Sanders	71.0% I	Safe I	Safe I	Safe I	Safe I	Likely I	Safe I	Safe I	Safe I	Safe I	Safe I	Sanders 67.4% I
Virginia	D+1	Tim Kaine	52.3% D	Safe D	Safe D	Safe D	Safe D	Likely D	Safe D	Safe D	Safe D	Safe D	Safe D	Kaine 57.0% D
Washington	D+7	Maria Cantwell	60.5% D	Safe D	Safe D	Safe D	Safe D	Likely D	Safe D	Safe D	Safe D	Safe D	Safe D	Cantwell 58.4% D
West Virginia	R+20	Joe Manchin	60.6% D	Lean D	Tilt D	Lean D	Lean D	Lean D	Lean D	Tossup	Lean D	Lean D	Likely D	Manchin 49.6% D
Wisconsin	EVEN	Tammy Baldwin	51.4% D	Likely D	Safe D	Likely D	Likely D	Likely D	Likely D	Lean D	Likely D	Likely D	Safe D	Baldwin 55.4% D
Wyoming	R+25	John Barrasso	75.7% R	Safe R	Safe R	Safe R	Safe R	Likely R	Safe R	Safe R	Safe R	Safe R	Safe R	Barrasso 67.0% R
Overall[l]				D - 43 R - 48 9 tossups	D - 48 R - 51 1 tossup	D - 48 R - 52 0 tossups	D - 43 R - 48 9 tossups	D - 45 R - 50 5 tossups	D - 45 R - 49 6 tossups	D - 43 R - 49 8 tossups	D - 44 R - 50 6 tossups	D - 45 R - 50 5 tossups	D - 48 R - 50 2 tossups	Results: D - 47 R - 53

These are the election dates for the regularly scheduled general elections.

State	Filing deadline[26]	Primary election[27]	Primary run-off (if necessary)[27]	General election	Poll closing (Eastern Time)[28]
Arizona	May 30, 2018	August 28, 2018	N/A	November 6, 2018	9pm
California	March 9, 2018	June 5, 2018	N/A	November 6, 2018	11pm
Connecticut	June 12, 2018	August 14, 2018	N/A	November 6, 2018	8pm
Delaware	July 10, 2018	September 6, 2018	N/A	November 6, 2018	8pm
Florida	May 4, 2018	August 28, 2018	N/A	November 6, 2018	7pm and 8pm
Hawaii	June 5, 2018	August 11, 2018	N/A	November 6, 2018	11pm
Indiana	February 9, 2018	May 8, 2018	N/A	November 6, 2018	6pm and 7pm
Maine	March 15, 2018	June 12, 2018	N/A	November 6, 2018	8pm
Maryland	February 27, 2018	June 26, 2018	N/A	November 6, 2018	8pm
Massachusetts	June 5, 2018	September 4, 2018	N/A	November 6, 2018	8pm
Michigan	April 24, 2018	August 7, 2018	N/A	November 6, 2018	8pm and 9pm
Minnesota	June 5, 2018	August 14, 2018	N/A	November 6, 2018	9pm
Mississippi	March 1, 2018	June 5, 2018	June 26, 2018	November 6, 2018	8pm
Mississippi (special)	March 26, 2018	November 6, 2018	N/A	November 27, 2018[m]	8pm
Missouri	March 27, 2018	August 7, 2018	N/A	November 6, 2018	8pm
Montana	March 12, 2018	June 5, 2018	N/A	November 6, 2018	10pm
Nebraska	March 1, 2018	May 15, 2018	N/A	November 6, 2018	9pm
Nevada	March 16, 2018	June 12, 2018	N/A	November 6, 2018	10pm
New Jersey	April 2, 2018	June 5, 2018	N/A	November 6, 2018	8pm
New Mexico	March 13, 2018	June 5, 2018	N/A	November 6, 2018	9pm
New York	April 12, 2018	June 26, 2018	N/A	November 6, 2018	9pm
North Dakota	April 9, 2018	June 12, 2018	N/A	November 6, 2018	8pm and 9pm
Ohio	February 7, 2018	May 8, 2018	N/A	November 6, 2018	7:30pm
Pennsylvania	March 20, 2018	May 15, 2018	N/A	November 6, 2018	8pm
Rhode Island	June 27, 2018	September 12, 2018	N/A	November 6, 2018	8pm
Tennessee	April 5, 2018	August 2, 2018	N/A	November 6, 2018	8pm
Texas	December 11, 2017	March 6, 2018	May 22, 2018 (unnecessary)	November 6, 2018	8pm and 9pm
Utah	March 15, 2018	June 26, 2018	N/A	November 6, 2018	10pm
Vermont	May 31, 2018	August 14, 2018	N/A	November 6, 2018	7pm
Virginia	March 29, 2018	June 12, 2018	N/A	November 6, 2018	7pm
Washington	May 18, 2018	August 7, 2018	N/A	November 6, 2018	11pm
West Virginia	January 27, 2018	May 8, 2018	N/A	November 6, 2018	7:30pm
Wisconsin	June 1, 2018	August 14, 2018	N/A	November 6, 2018	9pm
Wyoming	June 1, 2018	August 21, 2018	N/A	November 6, 2018	9pm

Three Republicans retired instead of seeking re-election.

State	Senator	Replaced by
Arizona	Jeff Flake	Kyrsten Sinema
Tennessee	Bob Corker	Marsha Blackburn
Utah	Orrin Hatch	Mitt Romney

Four Democrats and one Republican sought re-election but lost in the general election.

State	Senator	Replaced by
Florida	Bill Nelson	Rick Scott
Indiana	Joe Donnelly	Mike Braun
Missouri	Claire McCaskill	Josh Hawley
Nevada	Dean Heller	Jacky Rosen
North Dakota	Heidi Heitkamp	Kevin Cramer

One Republican resigned before the start of the 116th Congress on December 31, 2018, and another Republican resigned during the 116th Congress for health reasons. Initially, all were replaced by Republican appointees.

State	Senator	Replaced by
Arizona (Class 3)	Jon Kyl	Martha McSally
Georgia (Class 3)	Johnny Isakson	Kelly Loeffler

In these special elections, the winners will be seated before January 3, 2019, when elected and qualified. They are ordered by election date, then by state and by class.

State	Incumbent			Result	Candidates
	Senator	Party	Electoral history
Minnesota (Class 2)	Tina Smith	DFL	2018 (appointed)	Interim appointee elected.	▌Y Tina Smith (DFL) 53.0% ▌Karin Housley (Republican) 42.4% ▌Sarah Wellington (Legal Marijuana Now) 3.7% ▌Jerry Trooien (Independent) 0.9%
Mississippi (Class 2)	Cindy Hyde-Smith	Republican	2018 (appointed)	Interim appointee elected.	▌Y Cindy Hyde-Smith (Republican) 53.6%[29] ▌Mike Espy (Democratic) 46.4%[29]

In these general elections, the winners were elected for the term beginning January 3, 2019.

All of the elections involve the Class 1 seats and they are ordered by state.

State	Incumbent			Result	Candidates
	Senator	Party	Electoral history
Arizona	Jeff Flake	Republican	2012	Incumbent retired. Democratic gain.	▌Y Kyrsten Sinema (Democratic) 50.0% ▌Martha McSally (Republican) 47.6% ▌Angela Green (Green) 2.4%
California	Dianne Feinstein	Democratic	1992 (special) 1994 2000 2006 2012	Incumbent re-elected.	▌Y Dianne Feinstein (Democratic) 54.2% ▌Kevin de León (Democratic) 45.8%
Connecticut	Chris Murphy	Democratic	2012	Incumbent re-elected.	▌Y Chris Murphy (Democratic) 59.5% ▌Matthew Corey (Republican) 39.4% Others ▌Richard Lion (Libertarian) 0.6% ▌Jeff Russell (Green) 0.5%
Delaware	Tom Carper	Democratic	2000 2006 2012	Incumbent re-elected.	▌Y Tom Carper (Democratic) 60.0% ▌Robert Arlett (Republican) 37.8% Others ▌Demitri Theodoropoulos (Green) 1.2% ▌Nadine Frost (Libertarian) 1.1%
Florida	Bill Nelson	Democratic	2000 2006 2012	Incumbent lost re-election. Republican gain. Winner delayed term until January 8, 2019, to finish his term as Governor of Florida.	▌Y Rick Scott (Republican) 50.1% ▌Bill Nelson (Democratic) 49.9%
Hawaii	Mazie Hirono	Democratic	2012	Incumbent re-elected.	▌Y Mazie Hirono (Democratic) 71.2% ▌Ron Curtis (Republican) 28.8%
Indiana	Joe Donnelly	Democratic	2012	Incumbent lost re-election. Republican gain.	▌Y Mike Braun (Republican) 50.9% ▌Joe Donnelly (Democratic) 45.0% ▌Lucy Brenton (Libertarian) 4.0%
Maine	Angus King	Independent	2012	Incumbent re-elected.	▌Y Angus King (Independent) 54.3% ▌Eric Brakey (Republican) 35.2% ▌Zak Ringelstein (Democratic) 10.4%
Maryland	Ben Cardin	Democratic	2006 2012	Incumbent re-elected.	▌Y Ben Cardin (Democratic) 64.9% ▌Tony Campbell (Republican) 30.3% ▌Neal Simon (Independent) 3.7% ▌Arvin Vohra (Libertarian) 1.0%
Massachusetts	Elizabeth Warren	Democratic	2012	Incumbent re-elected.	▌Y Elizabeth Warren (Democratic) 60.4% ▌Geoff Diehl (Republican) 36.2% ▌Shiva Ayyadurai (Independent) 3.4%
Michigan	Debbie Stabenow	Democratic	2000 2006 2012	Incumbent re-elected.	▌Y Debbie Stabenow (Democratic) 52.3% ▌John James (Republican) 45.8% Others ▌Marcia Squier (Independent) 1.0% ▌George Huffman III (Constitution) 0.6% ▌John Wilhelm (Natural Law) 0.4%
Minnesota	Amy Klobuchar	DFL	2006 2012	Incumbent re-elected.	▌Y Amy Klobuchar (DFL) 60.3% ▌Jim Newberger (Republican) 36.2% ▌Dennis Schuller (Legal Marijuana Now) 2.5% ▌Paula M. Overby (Green) 0.9%
Mississippi	Roger Wicker	Republican	2007 (appointed) 2008 (special) 2012	Incumbent re-elected.	▌Y Roger Wicker (Republican) 58.5% ▌David Baria (Democratic) 39.5% Others ▌Danny Bedwell (Libertarian) 1.4% ▌Shawn O'Hara (Reform) 0.6%
Missouri	Claire McCaskill	Democratic	2006 2012	Incumbent lost re-election. Republican gain.	▌Y Josh Hawley (Republican) 51.4% ▌Claire McCaskill (Democratic) 45.6% Others ▌Craig O'Dear (Independent) 1.4% ▌Japheth Campbell (Libertarian) 1.1% ▌Jo Crain (Green) 0.5%
Montana	Jon Tester	Democratic	2006 2012	Incumbent re-elected.	▌Y Jon Tester (Democratic) 50.3% ▌Matt Rosendale (Republican) 46.8% ▌Rick Breckenridge (Libertarian) 2.9%
Nebraska	Deb Fischer	Republican	2012	Incumbent re-elected.	▌Y Deb Fischer (Republican) 57.7% ▌Jane Raybould (Democratic) 38.6% ▌Jim Schultz (Libertarian) 3.7%
Nevada	Dean Heller	Republican	2011 (appointed) 2012	Incumbent lost re-election. Democratic gain.	▌Y Jacky Rosen (Democratic) 50.4% ▌Dean Heller (Republican) 45.4% Others ▌Barry Michaels (Independent) 1.0% ▌Tim Hagan (Libertarian) 0.9% ▌Kamau Bakari (Independent American) 0.7%
New Jersey	Bob Menendez	Democratic	2006 (appointed) 2006 2012	Incumbent re-elected.	▌Y Bob Menendez (Democratic) 54.0% ▌Bob Hugin (Republican) 42.8% Others ▌Madelyn Hoffman (Green) 0.8% ▌Murray Sabrin (Libertarian) 0.7% ▌Natalie Rivera (For The People) 0.6% ▌Tricia Flanagan (New Day NJ) 0.5% ▌Kevin Kimple (Make It Simple) 0.3% ▌Hank Schroeder (Economic Growth) 0.3%
New Mexico	Martin Heinrich	Democratic	2012	Incumbent re-elected.	▌Y Martin Heinrich (Democratic) 54.1% ▌Mick Rich (Republican) 30.5% ▌Gary Johnson (Libertarian) 15.4%
New York	Kirsten Gillibrand	Democratic	2009 (appointed) 2010 (special) 2012	Incumbent re-elected.	▌Y Kirsten Gillibrand (Democratic) 67.0% ▌Chele Chiavacci Farley (Republican) 33.0%
North Dakota	Heidi Heitkamp	Democratic-NPL	2012	Incumbent lost re-election. Republican gain.	▌Y Kevin Cramer (Republican) 55.5% ▌Heidi Heitkamp (Democratic-NPL) 44.5%
Ohio	Sherrod Brown	Democratic	2006 2012	Incumbent re-elected.	▌Y Sherrod Brown (Democratic) 53.4% ▌Jim Renacci (Republican) 46.6%
Pennsylvania	Bob Casey Jr.	Democratic	2006 2012	Incumbent re-elected.	▌Y Bob Casey Jr. (Democratic) 55.7% ▌Lou Barletta (Republican) 42.6% Others ▌Dale Kerns (Libertarian) 1.0% ▌Neal Gale (Green) 0.6%
Rhode Island	Sheldon Whitehouse	Democratic	2006 2012	Incumbent re-elected.	▌Y Sheldon Whitehouse (Democratic) 61.6% ▌Robert Flanders (Republican) 38.4%
Tennessee	Bob Corker	Republican	2006 2012	Incumbent retired. Republican hold.	▌Y Marsha Blackburn (Republican) 54.7% ▌Phil Bredesen (Democratic) 43.9% Others ▌Trudy Austin (Independent) 0.4% ▌Dean Hill (Independent) 0.4% ▌Kris Todd (Independent) 0.2% ▌John Carico (Independent) 0.2% ▌Breton Phillips (Independent) 0.1% ▌Kevin McCants (Independent) 0.1%
Texas	Ted Cruz	Republican	2012	Incumbent re-elected.	▌Y Ted Cruz (Republican) 50.9% ▌Beto O'Rourke (Democratic) 48.3% ▌Neal Dikeman (Libertarian) 0.8%
Utah	Orrin Hatch	Republican	1976 1982 1988 1994 2000 2006 2012	Incumbent retired. Republican hold.	▌Y Mitt Romney (Republican) 62.6% ▌Jenny Wilson (Democratic) 30.9% ▌Tim Aalders (Constitution) 2.7% ▌Craig Bowden (Libertarian) 2.6% ▌Reed McCandless (Independent American) 1.2%
Vermont	Bernie Sanders	Independent	2006 2012	Incumbent re-elected.	▌Y Bernie Sanders (Independent) 67.4% ▌Lawrence Zupan (Republican) 27.5%
Virginia	Tim Kaine	Democratic	2012	Incumbent re-elected.	▌Y Tim Kaine (Democratic) 57.1% ▌Corey Stewart (Republican) 41.1% ▌Matt Waters (Libertarian) 1.8%
Washington	Maria Cantwell	Democratic	2000 2006 2012	Incumbent re-elected.	▌Y Maria Cantwell (Democratic) 58.4% ▌Susan Hutchison (Republican) 41.6%
West Virginia	Joe Manchin	Democratic	2010 (special) 2012	Incumbent re-elected.	▌Y Joe Manchin (Democratic) 49.6% ▌Patrick Morrisey (Republican) 46.3% ▌Rusty Hollen (Libertarian) 4.1%
Wisconsin	Tammy Baldwin	Democratic	2012	Incumbent re-elected.	▌Y Tammy Baldwin (Democratic) 55.4% ▌Leah Vukmir (Republican) 44.6%
Wyoming	John Barrasso	Republican	2007 (appointed) 2008 (special) 2012	Incumbent re-elected.	▌Y John Barrasso (Republican) 67.1% ▌Gary Trauner (Democratic) 30.1% ▌Joe Porambo (Libertarian) 2.8%

In twelve races the margin of victory was under 10%.

State	Party of winner	Margin
Florida	Republican (flip)	0.12%
Arizona	Democratic (flip)	2.34%
Texas	Republican	2.57%
West Virginia	Democratic	3.31%
Montana	Democratic	3.55%
Nevada	Democratic (flip)	5.03%
Missouri	Republican (flip)	5.81%
Indiana	Republican (flip)	5.89%[n]
Michigan	Democratic	6.51%
Ohio	Democratic	6.85%
Mississippi (special)	Republican	7.27%
California	Democratic	8.33%[o]

Arizona election

← 2012 2024 →
Turnout	64.85%
Nominee Kyrsten Sinema Martha McSally Party Democratic Republican Popular vote 1,191,100 1,135,200 Percentage 49.96% 47.61%
Sinema:      50–60%      60–70% McSally:      50–60%      60–70%      70–80%
U.S. senator before election Jeff Flake Republican Elected U.S. senator Kyrsten Sinema Democratic

One-term Republican Jeff Flake was elected with 49% of the vote in 2012. He chose not to run for re-election.^[30]

U.S. Representative Martha McSally^[31] won the Republican nomination in a three-way primary on August 28, 2018, against Joe Arpaio and Kelli Ward.

U.S. Representative Kyrsten Sinema^[31] easily secured the Democratic nomination.

Sinema defeated McSally by a slim margin; her victory became official only after six days of counting ballots.

Arizona Republican primary

Party		Candidate	Votes	%
	Republican	Martha McSally	357,626	54.57
	Republican	Kelli Ward	180,926	27.61
	Republican	Joe Arpaio	116,555	17.79
	Write-in		191	0.03
Total votes			655,298	100.00

Arizona Democratic primary

Party		Candidate	Votes	%
	Democratic	Kyrsten Sinema	404,170	79.25
	Democratic	Deedra Abboud	105,800	20.75
Total votes			509,970	100.00

Arizona general election^[32]

Party		Candidate	Votes	%	±%
	Democratic	Kyrsten Sinema	1,191,100	49.96%	+3.76
	Republican	Martha McSally	1,135,200	47.61%	–1.62
	Green	Angela Green	57,442	2.41%	N/A
	Write-in		566	0.02%	+0.01
Total votes			2,384,308	100.00%
	Democratic gain from Republican

California election

← 2012 2024 →
Turnout	56.42%
Nominee Dianne Feinstein Kevin de León Party Democratic Democratic Popular vote 6,019,422 5,093,942 Percentage 54.16% 45.84%
County results Feinstein:      50–60%      60–70% de León:      50–60%      60–70%      70–80%
U.S. senator before election Dianne Feinstein Democratic Elected U.S. senator Dianne Feinstein Democratic

Four-term Democrat Dianne Feinstein won a special election in 1992 and was elected to full terms in 1994, 2000, 2006, and 2012. She ran for re-election and advanced to the general election after securing the top spot in the June 5 jungle primary.^[33]

The June 5 primary ballot listed 32 candidates (Feinstein plus 31 challengers) in addition to 3 write-in candidates. There were 10 Democratic candidates, 11 Republican candidates, one Libertarian, one Peace and Freedom candidate, and 9 independent candidates. There was also a Green Party candidate who ran as a write-in.

President pro tempore of the California State Senate Kevin de León advanced to the general election for the right to challenge Feinstein after securing the second spot in the primary.^[33]

The 11 Republican candidates who ran in the primary combined for 33.2% of the vote. The top Republican candidate, James P. Bradley, received 8.3% of the vote, which put him in 3rd place at 3.8% behind the second-place finisher, Kevin DeLeon.^[34]

On November 6, Dianne Feinstein was elected to a fifth term, defeating Kevin de León.

California blanket primary

Party		Candidate	Votes	%
	Democratic	Dianne Feinstein (incumbent)	2,947,035	44.18
	Democratic	Kevin de León	805,446	12.07
	Republican	James P. Bradley	556,252	8.34
	Republican	Arun K. Bhumitra	350,815	5.26
	Republican	Paul A. Taylor	323,534	4.85
	Republican	Erin Cruz	267,494	4.01
	Republican	Tom Palzer	205,183	3.08
	Democratic	Alison Hartson	147,061	2.20
	Republican	Rocky De La Fuente	135,279	2.03
	Democratic	Pat Harris	126,947	1.90
	Republican	John "Jack" Crew	93,808	1.41
	Republican	Patrick Little	89,867	1.35
	Republican	Kevin Mottus	87,646	1.31
	Republican	Jerry Joseph Laws	67,140	1.01
	Libertarian	Derrick Michael Reid	60,000	0.90
	Democratic	Adrienne Nicole Edwards	56,172	0.84
	Democratic	Douglas Howard Pierce	42,671	0.64
	Republican	Mario Nabliba	39,209	0.59
	Democratic	David Hildebrand	30,305	0.45
	Democratic	Donnie O. Turner	30,101	0.45
	Democratic	Herbert G. Peters	27,468	0.41
	No party preference	David Moore	24,614	0.37
	No party preference	Ling Ling Shi	23,506	0.35
	Peace and Freedom	John Parker	22,825	0.34
	No party preference	Lee Olson	20,393	0.31
	Democratic	Gerald Plummer	18,234	0.27
	No party preference	Jason M. Hanania	18,171	0.27
	No party preference	Don J. Grundmann	15,125	0.23
	No party preference	Colleen Shea Fernald	13,536	0.20
	No party preference	Rash Bihari Ghosh	12,557	0.19
	No party preference	Tim Gildersleeve	8,482	0.13
	No party preference	Michael Fahmy Girgis	2,986	0.04
	Write-in		863	0.01
Total votes			6,670,720	100.00

California general election^[32]

Party		Candidate	Votes	%	±%
	Democratic	Dianne Feinstein (incumbent)	6,019,422	54.16%	–8.36
	Democratic	Kevin de León	5,093,942	45.84%	N/A
Total votes			11,113,364	100.00%
	Democratic hold

Connecticut election

← 2012 2024 →
Turnout	63.58%
Nominee Chris Murphy Matthew Corey Party Democratic Republican Popular vote 825,579 545,717 Percentage 59.53% 39.35%
County results Municipality results Murphy:      40–50%      50–60%      60–70%      70–80%      80–90%      >90% Corey:      40–50%      50–60%      60–70%
U.S. senator before election Chris Murphy Democratic Elected U.S. senator Chris Murphy Democratic

One-term Democrat Chris Murphy was elected with 55% of the vote in 2012. He ran for re-election.^[35]

Businessmen Matthew Corey^[36] received the Republican nomination.

Chris Murphy was elected to a second term, winning nearly 60% of the vote.^[37]

Connecticut Republican primary

Party		Candidate	Votes	%
	Republican	Matthew Corey	99,899	76.54
	Republican	Dominic Rapini	30,624	23.46
Total votes			130,523	100.00

Connecticut general election^[32]

Party		Candidate	Votes	%	±%
	Democratic	Chris Murphy (incumbent)	825,579	59.53%	+4.71
	Republican	Matthew Corey	545,717	39.35%	–3.72
	Libertarian	Richard Lion	8,838	0.64%	–1.02
	Green	Jeff Russell	6,618	0.48%	N/A
	Write-in		88	0.01%	–0.44
Total votes			1,386,840	100.00%
	Democratic hold

Delaware election

← 2012 2024 →
Turnout	52.18%
Nominee Tom Carper Rob Arlett Party Democratic Republican Popular vote 217,385 137,127 Percentage 59.95% 37.81%
Carper:      50–60%      60–70% Arlett:      50–60%
U.S. senator before election Tom Carper Democratic Elected U.S. senator Tom Carper Democratic

Three-term Democrat Tom Carper won re-election with 66% of the vote in 2012. He announced he was running for re-election during an interview on MSNBC on July 24, 2017.^[38] He defeated Dover community activist Kerri Evelyn Harris for the Democratic nomination. Sussex County Councilman Robert Arlett won the Republican nomination.^[38]

Tom Carper defeated Arlett, winning 60% of the vote.^[39]

Delaware Democratic primary

Party		Candidate	Votes	%
	Democratic	Tom Carper (incumbent)	53,635	64.59
	Democratic	Kerri Evelyn Harris	29,407	35.41
Total votes			83,042	100.00

Delaware Republican primary

Party		Candidate	Votes	%
	Republican	Rob Arlett	25,284	66.77
	Republican	Gene Truono	10,587	27.96
	Republican	Rocky De La Fuente	1,998	5.28
Total votes			37,870	100.00

Delaware general election^[32]

Party		Candidate	Votes	%	±%
	Democratic	Tom Carper (incumbent)	217,385	59.95%	–6.47
	Republican	Rob Arlett	137,127	37.82%	+8.87
	Green	Demitri Theodoropoulos	4,170	1.15%	+0.35
	Libertarian	Nadine Frost	3,910	1.08%	N/A
	Write-in		14	0.00%	N/A
Total votes			362,606	100.00%
	Democratic hold

Florida election

← 2012 2024 →
Turnout	61.68%
Nominee Rick Scott Bill Nelson Party Republican Democratic Popular vote 4,099,505 4,089,472 Percentage 50.05% 49.93%
Scott:      50–60%      60–70%      70–80%      80–90% Nelson:      50–60%      60–70%
U.S. senator before election Bill Nelson Democratic Elected U.S. senator Rick Scott Republican

Three-term Democrat Bill Nelson was re-elected with 55% of the vote in 2012. He sought re-election to a fourth term in office.^[40]

Florida Governor Rick Scott won the Republican nomination. First elected in 2010 and re-elected in 2014, Scott's term as Governor of Florida was set to end by January 2019, due to term limits.^[40]

Edward Janowski was running as an independent, but did not qualify.^[40]

Scott led among ballots tallied on election night, but given the close margins of the race recounts were ordered.^[41] Final recount numbers were released following a machine and hand recount with Rick Scott maintaining a lead.^[42] On November 18, Nelson conceded to Scott.^[43] Two days later, election results were certified by the state, cementing Scott's win.^[44]

Florida Republican primary

Party		Candidate	Votes	%
	Republican	Rick Scott	1,456,187	88.61
	Republican	Rocky De La Fuente	187,209	11.39
Total votes			1,643,396	100.00

Florida general election^[32]

Party		Candidate	Votes	%	±%
	Republican	Rick Scott	4,099,505	50.05%	+7.82
	Democratic	Bill Nelson (incumbent)	4,089,472	49.93%	–5.30
	Write-in		1,028	0.01%	+0.01
Total votes			8,190,005	100.00%
	Republican gain from Democratic

Hawaii election

← 2012 2024 →
Turnout	51.32%
Nominee Mazie Hirono Ron Curtis Party Democratic Republican Popular vote 276,316 112,035 Percentage 71.15% 28.85%
County results Hirono:      60–70%      70–80%
U.S. senator before election Mazie Hirono Democratic Elected U.S. senator Mazie Hirono Democratic

One-term Democrat Mazie Hirono was elected with 63% of the vote in 2012. She ran.^[45]

Ron Curtis was the Republican nominee.

Hirono was elected to a second term by a landslide.

Hawaii Democratic primary

Party		Candidate	Votes	%
	Democratic	Mazie Hirono (incumbent)	201,679	100.00
Total votes			201,679	100.00

Hawaii Republican primary

Party		Candidate	Votes	%
	Republican	Ron Curtis	6,370	23.73
	Republican	Consuelo Anderson	5,172	19.26
	Republican	Robert C. Helsham Sr.	3,988	14.85
	Republican	Thomas E. White	3,661	13.64
	Republican	Rocky De La Fuente	3,065	11.42
	Republican	George L. Berish	1,658	6.18
	Republican	Michael R. Hodgkiss	1,576	5.87
	Republican	Eddie Pirkowski	1,358	5.06
Total votes			26,848	100.00

Hawaii general election^[32]

Party		Candidate	Votes	%	±%
	Democratic	Mazie Hirono (incumbent)	276,316	71.15%	+8.55
	Republican	Ron Curtis	112,035	28.85%	–8.55
Total votes			388,351	100.00%
	Democratic hold

Indiana election

← 2012 2024 →
Turnout	50.42%
Nominee Mike Braun Joe Donnelly Party Republican Democratic Popular vote 1,158,000 1,023,553 Percentage 50.73% 44.84%
County results Braun:      40–50%      50–60%      60–70%      70–80% Donnelly:      40–50%      50–60%      60–70%
U.S. senator before election Joe Donnelly Democratic Elected U.S. senator Mike Braun Republican

One-term Democrat Joe Donnelly was elected with 50.04% of the vote in 2012. He ran. He won the Democratic primary unopposed.^[46]

State Representative Mike Braun^[46] won the May 8 Republican primary. U.S. Representatives Luke Messer^[47] and Todd Rokita^[47] also ran for the Republican nomination.

James Johnson ran as an independent.^[46]

Braun won election with 51% of the vote, defeating Joe Donnelly.^[48]

Indiana Democratic primary

Party		Candidate	Votes	%
	Democratic	Joe Donnelly (incumbent)	284,621	100.00
Total votes			284,621	100.00

Indiana Republican primary

Party		Candidate	Votes	%
	Republican	Mike Braun	208,602	41.17
	Republican	Todd Rokita	151,967	29.99
	Republican	Luke Messer	146,131	28.84
Total votes			506,700	100.00

Indiana general election^[32]

Party		Candidate	Votes	%	±%
	Republican	Mike Braun	1,158,000	50.73%	+6.45
	Democratic	Joe Donnelly (incumbent)	1,023,553	44.84%	–5.20
	Libertarian	Lucy Brenton	100,942	4.42%	–1.26
	Write-in		70	0.00%	N/A
Total votes			2,282,565	100.00%
	Republican gain from Democratic

Maine election

← 2012 2024 →
Turnout	59.96%
Nominee Angus King Eric Brakey Zak Ringelstein Party Independent Republican Democratic Popular vote 344,575 223,502 66,268 Percentage 54.31% 35.23% 10.45%
County results Municipality results King:      40–50%      50–60%      60–70%      70–80%      80–90%      >90% Brakey:      40–50%     50–60%      60–70%      70–80%      80–90%      >90% Tie:
U.S. senator before election Angus King Independent Elected U.S. senator Angus King Independent

One-term Independent Senator Angus King was elected in a three-way race with 53% of the vote in 2012. King has caucused with the Democratic Party since taking office in 2013, but he has left open the possibility of caucusing with the Republican Party in the future.^[49]

State Senator Eric Brakey ran unopposed for the Republican nomination.^[50]

Public school teacher and founder of UClass Zak Ringelstein ran unopposed for the Democratic nomination.^[50]

The election was conducted with ranked choice voting, as opposed to "First-past-the-post voting", after Maine voters passed a citizen referendum approving the change in 2016^[51] and a June 2018 referendum sustaining the change.^[52]

King was easily re-elected with over 50% of the vote.

Maine Democratic primary

Party		Candidate	Votes	%
	Democratic	Zak Ringelstein	89,841	100.00
Total votes			89,841	100.00

Maine Republican primary

Party		Candidate	Votes	%
	Republican	Eric Brakey	59,853	100.00
Total votes			59,853	100.00

Maine general election^[32]

Party		Candidate	Votes	%	±%
	Independent	Angus King (incumbent)	344,575	54.31%	+1.42
	Republican	Eric Brakey	223,502	35.23%	+4.48
	Democratic	Zak Ringelstein	66,268	10.45%	–2.81
	Write-in		64	0.01%	N/A
Total votes			634,409	100.00%
	Independent hold

Maryland election

← 2012 2024 →
Turnout	58.17%
Nominee Ben Cardin Tony Campbell Party Democratic Republican Popular vote 1,491,614 697,107 Percentage 64.86% 30.31%
Cardin:      40–50%      50–60%      60–70%      70–80%      80–90%      >90% Campbell:      50–60%      70–80%
U.S. senator before election Ben Cardin Democratic Elected U.S. senator Ben Cardin Democratic

Two-term Democrat Ben Cardin was re-elected with 56% of the vote in 2012. He won the Democratic primary.^[53]

Tony Campbell, Evan Cronhardt, Nnabu Eze, Gerald Smith, and Blaine Taylor^[54] were seeking the Republican nomination, with Campbell winning.

Arvin Vohra, vice chairman of the Libertarian National Committee, sought the Libertarian Party nomination.^[54]

Independents Neal Simon^[54] and Edward Shlikas^{[citation needed]}, and Michael B Puskar ran.

Cardin won re-election to a third term in office.^[55]

Maryland Democratic primary

Party		Candidate	Votes	%
	Democratic	Ben Cardin (incumbent)	477,441	80.28
	Democratic	Chelsea Manning	34,611	5.82
	Democratic	Jerome Segal	20,027	3.37
	Democratic	Debbie Wilson	18,953	3.19
	Democratic	Marcia H. Morgan	16,047	2.70
	Democratic	Lih Young	9,874	1.66
	Democratic	Richard Vaughn	9,480	1.59
	Democratic	Erik Jetmir	8,259	1.39
Total votes			594,692	100.00

Maryland Republican primary

Party		Candidate	Votes	%
	Republican	Tony Campbell	51,426	29.22
	Republican	Chris Chaffee	42,328	24.05
	Republican	Christina J. Grigorian	30,756	17.48
	Republican	John Graziani	15,435	8.77
	Republican	Blaine Taylor	8,848	5.03
	Republican	Gerald I. Smith Jr.	7,564	4.30
	Republican	Brian Charles Vaeth	5,411	3.07
	Republican	Evan M. Cronhardt	4,445	2.53
	Republican	Bill Krehnbrink	3,606	2.05
	Republican	Nnabu Eze	3,442	1.96
	Republican	Albert Binyahmin Howard	2,720	1.55
Total votes			175,981	100.00

Maryland general election^[32]

Party		Candidate	Votes	%	±%
	Democratic	Ben Cardin (incumbent)	1,491,614	64.86%	+8.88
	Republican	Tony Campbell	697,017	30.31%	+3.98
	Independent	Neal Simon	85,964	3.74%	N/A
	Libertarian	Arvin Vohra	22,943	1.00%	–0.22
	Write-in		2,351	0.10%	±0.00
Total votes			2,299,889	100.00%
	Democratic hold

Massachusetts election

← 2012 2024 →
Turnout	59.17%
Nominee Elizabeth Warren Geoff Diehl Party Democratic Republican Popular vote 1,633,371 979,210 Percentage 60.34% 36.17%
County results Municipality results Warren:      40–50%      50–60%      60–70%      70–80%      80–90%      >90% Diehl:      40–50%      50–60%      60–70%
U.S. senator before election Elizabeth Warren Democratic Elected U.S. senator Elizabeth Warren Democratic

One-term Democrat Elizabeth Warren was elected with 54% of the vote in 2012. She ran for re-election.^[56]

State Representative Geoff Diehl,^[57] attorney and founder of Better for America, John Kingston^[57] and former Romney aide Beth Lindstrom,^[57] ran for the Republican nomination. Diehl won the Republican nomination.

Shiva Ayyadurai^[58] ran as an independent. Shiva started as in early 2017 as the first Republican in the race, but went independent in November 2017.

Warren defeated Diehl, winning a second term.^[59]

Massachusetts Democratic primary

Party		Candidate	Votes	%
	Democratic	Elizabeth Warren (incumbent)	590,835	98.08
	Write-in		11,558	1.92
Total votes			602,393	100.00

Massachusetts Republican primary

Party		Candidate	Votes	%
	Republican	Geoff Diehl	144,043	55.15
	Republican	John Kingston III	69,636	26.66
	Republican	Beth Joyce Lindstrom	46,693	17.88
	Write-in		798	0.31
Total votes			261,170	100.00

Massachusetts general election^[32]

Party		Candidate	Votes	%	±%
	Democratic	Elizabeth Warren (incumbent)	1,633,371	60.34%	+6.60
	Republican	Geoff Diehl	979,210	36.17%	–10.02
	Independent	Shiva Ayyadurai	91,710	3.39%	N/A
	Write-in		2,799	0.10%	+0.03
Total votes			2,707,090	100.00%
	Democratic hold

Michigan election

← 2012 2024 →
Turnout	56.72%
Nominee Debbie Stabenow John James Party Democratic Republican Popular vote 2,214,478 1,938,818 Percentage 52.26% 45.76%
Stabenow:      40-50%      50–60%      60–70%      70–80% James:      40–50%      50–60%      60–70%      70–80%
U.S. senator before election Debbie Stabenow Democratic Elected U.S. senator Debbie Stabenow Democratic

Three-term Democrat Debbie Stabenow was re-elected with 59% of the vote in 2012.^[60] She was renominated without Democratic opposition. On the Republican side, businessman John James won the nomination.^[60]

In the final months of the election, polls showed the race was beginning to narrow. Ultimately, Stabenow was re-elected, defeating James, with a majority of the vote.

Michigan Democratic primary

Party		Candidate	Votes	%
	Democratic	Debbie Stabenow (incumbent)	1,045,450	100.00
Total votes			1,045,450	100.00

Michigan Republican primary

Party		Candidate	Votes	%
	Republican	John James	518,564	54.67
	Republican	Sandy Pensler	429,885	45.32
	Write-in		57	0.01
Total votes			948,506	100.00

Michigan general election^[32]

Party		Candidate	Votes	%	±%
	Democratic	Debbie Stabenow (incumbent)	2,214,478	52.26%	–6.54
	Republican	John James	1,938,818	45.76%	+7.78
	Green	Marcia Squier	40,204	0.95%	+0.35
	Constitution	George Huffman III	27,251	0.64%	+0.08
	Natural Law	John Howard Wilhelm	16,502	0.39%	+0.15
	Write-in		18	0.00%	±0.00
Total votes			4,237,271	100.00%
	Democratic hold

Minnesota general election

← 2012 2024 →
Turnout	63.89%
Nominee Amy Klobuchar Jim Newberger Party Democratic (DFL) Republican Popular vote 1,566,174 940,437 Percentage 60.31% 36.21%
Klobuchar:      40–50%      50–60%      60–70%      70–80% Newberger:      40–50%      50–60%      60–70%
U.S. senator before election Amy Klobuchar Democratic (DFL) Elected U.S. senator Amy Klobuchar Democratic (DFL)

Two-term Democrat Amy Klobuchar was re-elected with 65% of the vote in 2012. She ran for re-election.^[61]

State Representative Jim Newberger^[61] ran for the Republican nomination.

Klobuchar was easily re-elected.^[62]

Minnesota Democratic (DFL) primary

Party		Candidate	Votes	%
	Democratic (DFL)	Amy Klobuchar (incumbent)	557,306	95.70
	Democratic (DFL)	Steve Carlson	9,934	1.71
	Democratic (DFL)	Stephen A. Emery	7,047	1.21
	Democratic (DFL)	David Robert Groves	4,511	0.77
	Democratic (DFL)	Leonard J. Richards	3,552	0.61
Total votes			582,350	100.00

Minnesota Republican primary

Party		Candidate	Votes	%
	Republican	Jim Newberger	201,531	69.50
	Republican	Merrill Anderson	45,492	15.69
	Republican	Rae Hart Anderon	25,883	8.93
	Republican	Rocky De La Fuente	17,051	5.88
Total votes			289,957	100.00

Minnesota general election^[32]

Party		Candidate	Votes	%	±%
	Democratic (DFL)	Amy Klobuchar (incumbent)	1,566,174	60.31%	–4.92
	Republican	Jim Newberger	940,437	36.21%	+5.68
	Legal Marijuana Now	Dennis Schuller	66,236	2.55%	N/A
	Green	Paula M. Overby	23,101	0.89%	N/A
	Write-in		931	0.04%	–0.05
Total votes			2,596,879	100.00%
	Democratic (DFL) hold

Minnesota special election

← 2014 2020 →
Turnout	63.66%
Nominee Tina Smith Karin Housley Party Democratic (DFL) Republican Popular vote 1,370,540 1,095,777 Percentage 52.97% 42.35%
Smith:      40–50%      50–60%      60–70% Housley:      40–50%      50–60%      60–70%
U.S. senator before election Tina Smith Democratic (DFL) Elected U.S. senator Tina Smith Democratic (DFL)

Two-term Democrat Al Franken announced that he would resign in December 2017, following allegations of sexual harassment. Mark Dayton, Governor of Minnesota, appointed Lt. Gov. Tina Smith on January 2, 2018, as an interim Senator until the November 2018 election. She defeated primary challenger Richard Painter in the Democratic primary held on August 14.

Incumbent Tina Smith defeated Republican Karin Housley in the general election to finish the term ending January 3, 2021.

Minnesota Democratic (DFL) primary

Party		Candidate	Votes	%
	Democratic (DFL)	Tina Smith (incumbent)	433,705	76.06
	Democratic (DFL)	Richard Painter	78,193	13.71
	Democratic (DFL)	Ali Chehem Ali	18,897	3.31
	Democratic (DFL)	Gregg A. Iverson	17,825	3.13
	Democratic (DFL)	Nick Leonard	16,529	2.90
	Democratic (DFL)	Christopher Lovell Seymore Sr.	5,041	0.88
Total votes			570,190	100.00

Minnesota Republican primary

Party		Candidate	Votes	%
	Republican	Karin Housley	186,384	61.95
	Republican	Bob Anderson	107,102	35.60
	Republican	Nikolay Nikolayevich Bey	7,375	2.45
Total votes			300,861	100.00

Minnesota special election^[32]

Party		Candidate	Votes	%	±%
	Democratic (DFL)	Tina Smith (incumbent)	1,370,540	52.97%	–0.18
	Republican	Karin Housley	1,095,777	42.35%	–0.56
	Legal Marijuana Now	Sarah Wellington	95,614	3.70%	N/A
	Independent	Jerry Trooien	24,324	0.94%	N/A
	Write-in		1,101	0.04%	±0.00
Total votes			2,587,356	100.00%
	Democratic (DFL) hold

Mississippi general election

← 2012 2024 →
Turnout	49.66%
Nominee Roger Wicker David Baria Party Republican Democratic Popular vote 547,619 369,567 Percentage 58.49% 39.47%
Wicker:      40-50%      50–60%      60–70%      70–80%      80–90% Baria:      40-50%      50–60%      60–70%      70–80%
U.S. senator before election Roger Wicker Republican Elected U.S. senator Roger Wicker Republican

One-term Republican Roger Wicker won re-election with 57% of the vote in 2012. He was appointed in 2007 and won a special election in 2008 to serve the remainder of Trent Lott's term.^[29]

David Baria^[29] won the Democratic nomination in a run-off on June 26.

Wicker was easily re-elected.^[63]

Mississippi Republican primary

Party		Candidate	Votes	%
	Republican	Roger Wicker (incumbent)	130,118	82.79
	Republican	Richard Boyanton	27,052	17.21
Total votes			157,170	100.00

Mississippi Democratic primary

Party		Candidate	Votes	%
	Democratic	Howard Sherman	27,957	31.79
	Democratic	David Baria	27,244	30.98
	Democratic	Omeria Scott	21,278	24.20
	Democratic	Victor G. Maurice Jr.	4,361	4.96
	Democratic	Jerome Garland	4,266	4.85
	Democratic	Jensen Bohren	2,825	3.21
Total votes			87,931	100.00

Mississippi Democratic primary runoff

Party		Candidate	Votes	%
	Democratic	David Baria	44,156	58.64
	Democratic	Howard Sherman	31,149	41.36
Total votes			75,305	100.00

Mississippi general election^[32]

Party		Candidate	Votes	%	±%
	Republican	Roger Wicker (incumbent)	547,619	58.49%	+1.33
	Democratic	David Baria	369,567	39.47%	–1.08
	Libertarian	Danny Bedwell	12,981	1.39%	N/A
	Reform	Shawn O'Hara	6,048	0.65%	–0.58
Total votes			936,215	100.00%
	Republican hold

2018 United States Senate special election in Mississippi

← 2014 November 6, 2018 (first round) November 27, 2018 (runoff) 2020 →
Turnout	48.14%
Candidate Cindy Hyde-Smith Mike Espy Chris McDaniel Party Republican Democratic Republican First round 389,995 41.2% 386,742 40.9% 154,878 16.4% Runoff 486,769 53.6% 420,819 46.4% Eliminated
First round county results Runoff county results County results Hyde-Smith:      30–40%      40–50%      50–60%      60–70%      70–80%      80–90% Espy:      30–40%      40–50%      50–60%      60–70%      70–80%      80–90% McDaniel:      30–40%      40–50%
U.S. senator before election Cindy Hyde-Smith Republican Elected U.S. Senator Cindy Hyde-Smith Republican

Seven-term Republican Thad Cochran, who won re-election with 59.9% of the vote in 2014, announced that he would resign since April 1, 2018 for health reasons.^[64] Phil Bryant, Governor of Mississippi, announced on March 21, 2018, that he would appoint Mississippi Agriculture Commissioner Cindy Hyde-Smith to fill the vacancy.^[65] She ran in the special election.^[29]

On November 6, a nonpartisan jungle primary took place on the same day as the regularly scheduled U.S. Senate election for the seat currently held by Roger Wicker. Party affiliations were not printed on the ballot.^[66] As no candidate gained 50% of the votes, a runoff special election between the top two candidates - Hyde-Smith and former United States Secretary of Agriculture Mike Espy^[29] - was held on November 27, 2018. Hyde-Smith won the runoff election.

Democrat Tobey Bartee^[67] and Republican Chris McDaniel also contested the first round of the election.^[29]

Mississippi special election

Party		Candidate	Votes	%
	Nonpartisan	Cindy Hyde-Smith (incumbent)	389,995	41.25
	Nonpartisan	Mike Espy	386,742	40.90
	Nonpartisan	Chris McDaniel	154,878	16.38
	Nonpartisan	Tobey Bernard Bartee	13,852	1.47
Total votes			945,467	100.00

Mississippi special election runoff^[32]

Party		Candidate	Votes	%	±%
	Nonpartisan	Cindy Hyde-Smith (incumbent)	486,769	53.63%	–6.27
	Nonpartisan	Mike Espy	420,819	46.37%	+8.48
Total votes			907,588	100.00%
	Republican hold

Missouri election

← 2012 2024 →
Turnout	58.23%
Nominee Josh Hawley Claire McCaskill Party Republican Democratic Popular vote 1,254,927 1,112,935 Percentage 51.38% 45.57%
Hawley:      40–50%      50–60%      60–70%      70–80%      80–90% McCaskill:      40–50%      50–60%      60–70%      80–90%
U.S. senator before election Claire McCaskill Democratic Elected U.S. senator Josh Hawley Republican

Two-term Democrat Claire McCaskill was re-elected with 55% of the vote in 2012. She was renominated.^[68]

Attorney General Josh Hawley^[68] won the Republican nomination.^[69] Japheth Campbell declared his candidacy for the Libertarian nomination.^[68]

Polls showed a close race for months leading up to the election. Hawley defeated McCaskill in the general election.^[70]

Missouri Democratic primary

Party		Candidate	Votes	%
	Democratic	Claire McCaskill (incumbent)	501,872	82.60
	Democratic	Carla Wright	41,126	6.77
	Democratic	David Faust	15,984	2.63
	Democratic	John Hogan	15,958	2.63
	Democratic	Angelica Earl	15,500	2.55
	Democratic	Travis Gonzalez	9,480	1.56
	Democratic	Leonard Joseph Steinman II	7,657	1.26
Total votes			607,577	100.00

Missouri Republican primary

Party		Candidate	Votes	%
	Republican	Josh Hawley	389,978	58.64
	Republican	Tony Monetti	64,834	9.75
	Republican	Austin Petersen	54,916	8.26
	Republican	Kristi Nichols	49,640	7.47
	Republican	Christina Smith	35,024	5.27
	Republican	Ken Patterson	19,579	2.94
	Republican	Peter Pfeifer	16,594	2.50
	Republican	Courtland Sykes	13,870	2.09
	Republican	Fred Ryman	8,781	1.32
	Republican	Brian G. Hagg	6,871	1.03
	Republican	Bradley Krembs	4,902	0.74
Total votes			664,889	100.00

Missouri general election^[32]

Party		Candidate	Votes	%	±%
	Republican	Josh Hawley	1,254,927	51.38%	+12.27
	Democratic	Claire McCaskill (incumbent)	1,112,935	45.57%	–9.24
	Independent	Craig O'Dear	34,398	1.41%	N/A
	Libertarian	Japheth Campbell	27,316	1.12%	–4.95
	Green	Jo Crain	12,706	0.52%	N/A
	Write-in		7	0.00%	–0.01
Total votes			2,442,289	100.00%
	Republican gain from Democratic