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United States · Election results history · 2010 Senate · Colorado
Election 2010 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.

2010 US Senate election in Colorado

Michael F. Bennet (Democrat) beat Ken Buck (Republican) in Colorado in 2010, 48.1% to 46.4%, a margin of 1.6 points and 28,859 votes.

The Democratic hold continued from 2004, when Ken Salazar won.

Republicans led in 37 of the 64 counties and Democrats in 27. The largest, Jefferson, cast 225,247 votes and went to the Democrat by 2.4 points. The closest was Mineral, where 23 votes separated the two parties.

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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.

Senate

CandidatePartyVotesShare
Michael F. Bennet won Democratic 851,590 48.1%
Ken Buck Republican 822,731 46.4%
All other candidates 97,965 5.5%
Total1,772,286

Every county

CountyDemocratRepublicanOthersTotalMargin
Jefferson 108,954 48.4% 103,657 46.0% 12,636 225,247 D+2.4
Arapahoe 97,240 49.5% 88,959 45.3% 10,175 196,374 D+4.2
El Paso 66,162 34.1% 116,805 60.3% 10,850 193,817 R+26.1
Denver 135,793 71.4% 46,149 24.3% 8,175 190,117 D+47.2
Boulder 84,264 67.3% 35,451 28.3% 5,550 125,265 D+39.0
Larimer 59,456 48.1% 56,954 46.1% 7,266 123,676 D+2.0
Douglas 41,013 35.4% 69,986 60.4% 4,835 115,834 R+25.0
Adams 55,601 50.1% 47,455 42.7% 8,025 111,081 D+7.3
Weld 29,389 37.0% 45,482 57.2% 4,574 79,445 R+20.3
Mesa 17,522 32.1% 32,983 60.5% 4,005 54,510 R+28.4
Pueblo 28,779 53.9% 22,031 41.3% 2,585 53,395 D+12.6
Broomfield 11,034 48.7% 10,382 45.9% 1,227 22,643 D+2.9
La Plata 10,327 50.4% 9,301 45.4% 865 20,493 D+5.0
Garfield 8,062 45.4% 8,423 47.4% 1,286 17,771 R+2.0
Fremont 5,185 32.7% 9,335 58.8% 1,352 15,872 R+26.1
Montrose 4,627 29.4% 9,887 62.8% 1,234 15,748 R+33.4
Eagle 7,707 53.1% 6,002 41.3% 817 14,526 D+11.7
Delta 3,932 30.3% 8,025 61.8% 1,028 12,985 R+31.5
Elbert 2,647 24.4% 7,574 69.7% 640 10,861 R+45.4
Summit 5,832 58.3% 3,713 37.1% 458 10,003 D+21.2
Teller 2,982 30.5% 6,249 64.0% 539 9,770 R+33.4
Montezuma 3,349 35.0% 5,648 59.1% 564 9,561 R+24.0
Routt 5,281 56.2% 3,696 39.3% 421 9,398 D+16.9
Chaffee 3,936 47.0% 3,892 46.5% 548 8,376 D+0.5
Morgan 2,847 35.2% 4,732 58.4% 520 8,099 R+23.3
Park 2,848 38.0% 4,090 54.5% 561 7,499 R+16.6
Logan 2,390 32.2% 4,483 60.4% 549 7,422 R+28.2
Pitkin 5,091 69.5% 1,951 26.6% 282 7,324 D+42.9
Grand 2,795 43.2% 3,257 50.3% 425 6,477 R+7.1
Otero 2,633 41.5% 3,277 51.7% 427 6,337 R+10.2
Gunnison 3,435 54.9% 2,377 38.0% 448 6,260 D+16.9
Las Animas 2,842 52.0% 2,286 41.8% 338 5,466 D+10.2
Archuleta 1,952 38.0% 2,875 55.9% 316 5,143 R+17.9
Alamosa 2,656 54.0% 1,977 40.2% 285 4,918 D+13.8
Clear Creek 2,385 52.3% 1,876 41.1% 300 4,561 D+11.2
Moffat 1,104 24.2% 3,080 67.6% 372 4,556 R+43.4
Rio Grande 1,871 42.4% 2,292 51.9% 251 4,414 R+9.5
Yuma 1,010 26.4% 2,614 68.3% 205 3,829 R+41.9
Prowers 1,182 32.0% 2,271 61.4% 243 3,696 R+29.5
Conejos 1,625 53.0% 1,312 42.8% 131 3,068 D+10.2
San Miguel 2,064 68.5% 766 25.4% 185 3,015 D+43.1
Kit Carson 740 25.2% 2,012 68.4% 189 2,941 R+43.3
Huerfano 1,530 52.6% 1,205 41.4% 175 2,910 D+11.2
Gilpin 1,358 51.1% 1,100 41.4% 201 2,659 D+9.7
Ouray 1,295 49.8% 1,164 44.7% 143 2,602 D+5.0
Rio Blanco 480 19.0% 1,883 74.4% 168 2,531 R+55.4
Saguache 1,382 58.2% 838 35.3% 156 2,376 D+22.9
Custer 680 29.9% 1,453 63.9% 141 2,274 R+34.0
Washington 470 21.0% 1,619 72.4% 147 2,236 R+51.4
Lake 1,208 55.8% 790 36.5% 167 2,165 D+19.3
Phillips 555 28.7% 1,274 65.9% 103 1,932 R+37.2
Baca 548 28.4% 1,248 64.7% 133 1,929 R+36.3
Lincoln 482 26.2% 1,234 67.0% 127 1,843 R+40.8
Bent 652 41.1% 811 51.2% 122 1,585 R+10.0
Costilla 1,004 69.4% 348 24.0% 95 1,447 D+45.3
Crowley 474 36.5% 717 55.2% 108 1,299 R+18.7
Sedgwick 397 36.6% 592 54.6% 95 1,084 R+18.0
Dolores 334 33.8% 576 58.4% 77 987 R+24.5
Cheyenne 187 19.8% 696 73.8% 60 943 R+54.0
Kiowa 181 23.9% 532 70.4% 43 756 R+46.4
Jackson 218 29.9% 433 59.5% 77 728 R+29.5
Hinsdale 225 39.3% 314 54.8% 34 573 R+15.5
Mineral 247 43.3% 270 47.4% 53 570 R+4.0
San Juan 234 52.5% 177 39.7% 35 446 D+12.8

Margin: the Democrat's share of all votes minus the Republican's. Sources and how the results were checked.

Colorado Senate elections we hold

YearWinnerMargin
2022 Michael Bennet (D) D+14.6
2020 John W Hickenlooper (D) D+9.3
2016 Michael F. Bennet (D) D+5.7
2014 Cory Gardner (R) R+1.9
2010 Michael F. Bennet (D) D+1.6
2008 Mark Udall (D) D+10.3
2004 Ken Salazar (D) D+4.8
2002 Wayne Allard (R) R+4.9
1998 Ben Nighthorse Campbell (R) R+27.5
1996 Wayne Allard (R) R+5.7
1992 Ben Nighthorse Campbell (D) D+9.1
1990 Hank Brown (R) R+14.0
1986 Timothy E. Wirth (D) D+1.6
1984 William L. Armstrong (R) R+29.6
1980 Gary Hart (D) D+1.6
1978 William L. Armstrong (R) R+18.4
1974 Gary Hart (D) D+17.7
1972 Floyd K. Haskell (D) D+1.0
1968 Peter H. Dominick (R) R+17.1
1966 Gordon Allott (R) R+16.1
1962 Peter H. Dominick (R) R+8.0
1960 Gordon Allott (R) R+7.5
1956 John A. Carroll (D) D+0.4
1954 Gordon Allott (R) R+2.6
1950 Eugene D. Millikin (R) R+6.5
1948 Edwin C. Johnson (D) D+34.4
1944 Eugene Millikin (R) R+12.7
1942 Edwin C. Johnson (D) D+1.0
1938 Alva B. Adams (D) D+18.1
1936 Edwin C. Johnson (D) D+28.2
1932 Alva B. Adams (D) D+6.4
1930 Edward P. Costigan (D) D+13.2
1926 Charles W. Waterman (R) R+3.9
1924 Lawrence C. Phipps (R) R+6.3
1920 Samuel D. Nicholson (R) R+15.2
1918 Lawrence C. Phipps (R) R+1.6
1914 Charles S. Thomas (D) D+1.3