Election 2018 Results
Each election opens in its own mode: the forecast before the votes are counted, the live count while races are still too close to call, and the results once every race is decided.
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2018 Senate election results by state and county
Democrats won 22 of the Senate seats up and took the House in Trump's midterm, but Republicans gained two Senate seats by beating incumbents in Trump states.
33 Senate races were held in 2018, plus 2 special elections. Democrats won 21 and Republicans 10, and 2 went to neither party.
The closest were Florida (R+0.1), Arizona (D+2.3) and Texas (R+2.6). 6 seats changed party: Arizona to the Democrats, Florida to the Republicans, Indiana to the Republicans, Missouri to the Republicans, Nevada to the Democrats and North Dakota to the Republicans.
Early projection, based on early and incomplete polling: the likely matchups, each weighted by the betting markets' odds of both nominations, not a result. Each county is its 2024 presidential margin moved by its state's projected swing; set a national vote and every state, district and county moves by the same amount from our projection. Colours run in 100 steps from a safe Republican to a safe Democratic margin. Boundaries: US Census Bureau.
About the 2018 Senate elections
The 2018 map was hard for Democrats, who were defending 10 seats in states Trump had carried. Anger at Trump helped them win the House, but the Senate went the other way. Democrats won 22 races and Republicans 12, yet Republicans made a net gain of two seats for a 53-47 majority. Republicans gained four seats. In Florida, Governor Rick Scott beat Bill Nelson by about 0.1 points after a recount. Josh Hawley beat Claire McCaskill in Missouri, Mike Braun beat Joe Donnelly in Indiana, and Kevin Cramer beat Heidi Heitkamp in North Dakota. Democrats gained two. In Arizona, Kyrsten Sinema beat Martha McSally by 2.3 points, and in Nevada Jacky Rosen unseated Dean Heller. In Texas, Ted Cruz beat Beto O'Rourke by 2.6 points, the closest Texas Senate race in decades. Joe Manchin held West Virginia and Jon Tester held Montana, both in states Trump had won easily. Sherrod Brown kept Ohio by 6.8 points.
Every race
| State | Democrat | Votes | Republican | Votes | Others | Margin |
|---|---|---|---|---|---|---|
| Arizona flip | Kyrsten Sinema | 1,191,100 (50.0%) | Martha McSally | 1,135,200 (47.6%) | 58,008 | D+2.3 |
| California | Dianne Feinstein | 6,019,422 (54.2%) | none | Kevin de León (Democratic) 5,093,942 (45.8%) |
D+54.2 | |
| Connecticut | Christopher S Murphy | 825,579 (59.5%) | Matthew Corey | 545,717 (39.3%) | 15,544 | D+20.2 |
| Delaware | Thomas R Carper | 217,385 (60.0%) | Robert B Arlett | 137,127 (37.8%) | 8,080 | D+22.1 |
| Florida flip | Bill Nelson | 4,089,472 (49.9%) | Rick Scott | 4,099,505 (50.1%) | 1,028 | R+0.1 |
| Hawaii | Mazie K. Hirono | 276,316 (71.2%) | Ron Curtis | 112,035 (28.8%) | D+42.3 | |
| Indiana flip | Joe Donnelly | 1,023,553 (44.8%) | Mike Braun | 1,158,000 (50.7%) | 101,012 | R+5.9 |
| Maine | Zak Ringelstein | 66,268 (10.4%) | Eric Brakey | 223,502 (35.2%) | Angus King (Independent) 344,575 (54.3%) |
Ind. +19.1 |
| Maryland | Ben Cardin | 1,491,614 (64.9%) | Tony Campbell | 697,017 (30.3%) | 111,258 | D+34.6 |
| Massachusetts | Elizabeth A. Warren | 1,633,371 (60.3%) | Geoff Diehl | 979,210 (36.2%) | 94,509 | D+24.2 |
| Michigan | Debbie Stabenow | 2,214,478 (52.3%) | John James | 1,938,818 (45.8%) | 83,975 | D+6.5 |
| Minnesota | Amy Klobuchar | 1,566,174 (60.3%) | Jim Newberger | 940,437 (36.2%) | 90,268 | D+24.1 |
| Minnesota (special) | Tina Smith | 1,370,540 (53.0%) | Karin Housley | 1,095,777 (42.4%) | 121,039 | D+10.6 |
| Mississippi | David Baria | 369,567 (39.5%) | Roger F. Wicker | 547,619 (58.5%) | 19,029 | R+19.0 |
| Mississippi (special) | Mike Espy | 420,819 (46.4%) | Cindy Hyde-Smith | 486,769 (53.6%) | R+7.3 | |
| Mississippi: Decided in the November 27 runoff. | ||||||
| Missouri flip | Claire McCaskill | 1,112,935 (45.6%) | Josh Hawley | 1,254,927 (51.4%) | 74,427 | R+5.8 |
| Montana | Jon Tester | 253,876 (50.3%) | Matt Rosendale | 235,963 (46.8%) | 14,545 | D+3.6 |
| Nebraska | Jane Raybould | 269,917 (38.6%) | Deb Fischer | 403,151 (57.7%) | 25,815 | R+19.1 |
| Nevada flip | Jacky Rosen | 490,071 (50.4%) | Dean Heller | 441,202 (45.4%) | 40,859 | D+5.0 |
| New Jersey | Robert Menendez | 1,711,654 (54.0%) | Bob Hugin | 1,357,355 (42.8%) | 100,301 | D+11.2 |
| New Mexico | Martin Heinrich | 376,998 (54.1%) | Mick Rich | 212,813 (30.5%) | Gary Johnson (Libertarian) 107,201 (15.4%) |
D+23.6 |
| New York | Kirsten E. Gillibrand | 4,056,931 (67.0%) | Chele Chiavacci Farley | 1,998,220 (33.0%) | D+34.0 | |
| North Dakota flip | Heidi Heitkamp | 144,376 (44.3%) | Kevin Cramer | 179,720 (55.1%) | 2,042 | R+10.8 |
| Ohio | Sherrod Brown | 2,355,923 (53.4%) | Jim Renacci | 2,053,963 (46.6%) | 1,012 | D+6.9 |
| Pennsylvania | Robert P Casey Jr | 2,777,680 (55.6%) | Louis J. Barletta | 2,134,848 (42.7%) | 82,115 | D+12.9 |
| Rhode Island | Sheldon Whitehouse | 231,477 (61.4%) | Robert G. Flanders, Jr. | 144,421 (38.3%) | 840 | D+23.1 |
| Tennessee | Phil Bredesen | 985,450 (43.9%) | Marsha Blackburn | 1,227,483 (54.7%) | 30,807 | R+10.8 |
| Texas | Beto O'Rourke | 4,045,632 (48.3%) | Ted Cruz | 4,260,553 (50.9%) | 65,470 | R+2.6 |
| Utah | Jenny Wilson | 328,541 (30.9%) | Mitt Romney | 665,215 (62.6%) | 69,089 | R+31.7 |
| Vermont | none | Lawrence Zupan | 74,815 (27.4%) | Bernie Sanders (Independent) 183,649 (67.4%) |
Ind. +39.9 | |
| Virginia | Timothy M. Kaine | 1,910,370 (57.0%) | Corey A. Stewart | 1,374,313 (41.0%) | 66,690 | D+16.0 |
| Washington | Maria Cantwell | 1,803,364 (58.4%) | Susan Hutchison | 1,282,804 (41.6%) | D+16.9 | |
| West Virginia | Joe Manchin | 290,510 (49.6%) | Patrick Morrisey | 271,113 (46.3%) | 24,411 | D+3.3 |
| Wisconsin | Tammy Baldwin | 1,472,914 (55.4%) | Leah Vukmir | 1,184,885 (44.6%) | 42 | D+10.8 |
| Wyoming | Gary Trauner | 61,227 (30.1%) | John Barrasso | 136,210 (67.0%) | 5,983 | R+36.9 |
Margin: the Democrat's share of all votes minus the Republican's. Margins are Democrat minus Republican, of all votes. Certified results, from the states' own archives, the MIT Election Data and Science Lab, Heideman (2026) and Algara & Amlani (2021). How these results were checked.