Election 2004 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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2004 Senate election results by state and county
Bush won re-election and Republicans took 19 of the Senate seats up, gaining four overall and defeating Democratic leader Tom Daschle in South Dakota.
34 Senate races were held in 2004. Democrats won 15 and Republicans 19.
The closest were Florida (R+1.1), South Dakota (R+1.2) and Kentucky (R+1.3). 7 seats changed party: Colorado to the Democrats, Florida to the Republicans, Illinois to the Democrats, Louisiana to the Republicans, North Carolina to the Republicans, South Carolina to the Republicans and South 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 2004 Senate elections
Bush beat John Kerry in an election fought over the Iraq War and terrorism. Republicans gained ground across the South, where five Democratic senators had retired. Republicans won 19 Senate races and Democrats 15, and made a net gain of four seats for a 55-44 majority. Republicans took open seats in Florida with Mel Martinez, Georgia with Johnny Isakson, Louisiana with David Vitter, North Carolina with Richard Burr, and South Carolina with Jim DeMint. In South Dakota, John Thune beat Minority Leader Tom Daschle by 1.1 points, the first time in more than 50 years that a Senate party leader had lost re-election. Democrats gained two seats. In Illinois, state senator Barack Obama won an open seat by a wide margin after his keynote speech at the Democratic convention made him a national figure. In Colorado, Ken Salazar beat Pete Coors by 4.8 points. Lisa Murkowski held Alaska against Tony Knowles, and Jim Bunning held Kentucky by 1.3 points.
Every race
| State | Democrat | Votes | Republican | Votes | Others | Margin |
|---|---|---|---|---|---|---|
| Alabama | Wayne Sowell | 595,018 (32.4%) | Richard C. Shelby | 1,242,200 (67.5%) | 1,848 | R+35.2 |
| Alaska | Tony Knowles | 140,424 (45.5%) | Lisa Murkowski | 149,773 (48.6%) | 18,118 | R+3.0 |
| Arizona | Stuart Starky | 404,507 (20.6%) | John McCain | 1,505,372 (76.7%) | 51,798 | R+56.1 |
| Arkansas | Blanche L. Lincoln | 580,973 (55.9%) | Jim Holt | 458,036 (44.1%) | 340 | D+11.8 |
| California | Barbara Boxer | 6,955,728 (57.7%) | Bill Jones | 4,555,922 (37.8%) | 541,645 | D+19.9 |
| Colorado flip | Ken Salazar | 1,081,188 (51.3%) | Pete Coors | 980,668 (46.5%) | 45,616 | D+4.8 |
| Connecticut | Christopher J. Dodd | 945,347 (66.4%) | Jack C. Orchulli | 457,749 (32.1%) | 21,630 | D+34.2 |
| Florida flip | Betty Castor | 3,590,201 (48.3%) | Mel Martinez | 3,672,864 (49.4%) | 166,829 | R+1.1 |
| Georgia | Denise L. Majette | 1,287,690 (40.0%) | Johnny Isakson | 1,864,202 (57.9%) | 69,089 | R+17.9 |
| Hawaii | Daniel K. Inouye | 313,629 (75.5%) | Cam Cavasso | 87,172 (21.0%) | 14,546 | D+54.5 |
| Idaho | none | Mike Crapo | 499,796 (99.2%) | 4,136 | R+99.2 | |
| Illinois flip | Barack Obama | 3,597,456 (70.0%) | Alan Keyes | 1,390,690 (27.0%) | 153,374 | D+42.9 |
| Indiana | Evan Bayh | 1,496,976 (61.6%) | Marvin Scott | 903,913 (37.2%) | 27,344 | D+24.4 |
| Iowa | Arthur Small | 412,365 (27.9%) | Charles E. Grassley | 1,038,175 (70.2%) | 28,688 | R+42.3 |
| Kansas | Lee Jones | 310,337 (27.5%) | Sam Brownback | 780,863 (69.2%) | 37,822 | R+41.7 |
| Kentucky | Daniel Mongiardo | 850,855 (49.3%) | Jim Bunning | 873,507 (50.7%) | R+1.3 | |
| Louisiana flip | Chris John | 542,150 (29.3%) | David Vitter | 943,014 (51.0%) | John Neely Kennedy (Democratic) 275,821 (14.9%) |
R+21.7 |
| Maryland | Barbara A. Mikulski | 1,504,691 (64.8%) | E. J. Pipkin | 783,055 (33.7%) | 34,185 | D+31.1 |
| Missouri | Nancy Farmer | 1,158,261 (42.8%) | Christopher S. Bond | 1,518,089 (56.1%) | 30,052 | R+13.3 |
| Nevada | Harry Reid | 494,805 (61.1%) | Richard Ziser | 284,640 (35.1%) | 30,623 | D+25.9 |
| New Hampshire | Doris R. Haddock | 221,549 (33.7%) | Judd Gregg | 434,847 (66.2%) | 690 | R+32.5 |
| New York | Chuck Schumer | 4,769,824 (71.2%) | Howard Mills | 1,625,069 (24.2%) | 307,982 | D+46.9 |
| North Carolina flip | Erskine Bowles | 1,632,527 (47.0%) | Richard Burr | 1,791,450 (51.6%) | 48,105 | R+4.6 |
| North Dakota | Byron L. Dorgan | 212,143 (68.3%) | Mike Liffrig | 98,553 (31.7%) | D+36.6 | |
| Ohio | Eric D. Fingerhut | 1,961,171 (36.1%) | George V. Voinovich | 3,464,356 (63.8%) | 296 | R+27.7 |
| Oklahoma | Brad Carson | 596,750 (41.2%) | Tom Coburn | 763,433 (52.8%) | Sheila Bilyeu (Independent) 86,663 (6.0%) |
R+11.5 |
| Oregon | Ron Wyden | 1,128,728 (63.4%) | Al King | 565,254 (31.7%) | 86,568 | D+31.7 |
| Pennsylvania | Joseph M. Hoeffel | 2,334,126 (42.0%) | Arlen Specter | 2,925,080 (52.6%) | 299,899 | R+10.6 |
| South Carolina flip | Inez Tenenbaum | 704,384 (44.1%) | Jim Demint | 857,167 (53.7%) | 35,670 | R+9.6 |
| South Dakota flip | Tom Daschle | 193,340 (49.4%) | John Thune | 197,848 (50.6%) | R+1.2 | |
| Utah | R. Paul Van Dam | 258,955 (28.4%) | Robert F. Bennett | 626,640 (68.7%) | 26,131 | R+40.3 |
| Vermont | Patrick J. Leahy | 216,972 (70.6%) | Jack McMullen | 75,398 (24.5%) | 14,838 | D+46.1 |
| Washington | Patty Murray | 1,549,708 (55.0%) | George R. Nethercutt | 1,204,584 (42.7%) | 64,359 | D+12.2 |
| Wisconsin | Russel D. Feingold | 1,632,697 (55.4%) | Tim Michels | 1,301,183 (44.1%) | 15,863 | D+11.2 |
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.