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United States · Election results history · 2010 Senate · California
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 California

Barbara Boxer (Democrat) beat Carly Fiorina (Republican) in California in 2010, 52.2% to 42.2%, a margin of 10.0 points and 1,001,075 votes.

The Democratic hold continued from 2004, when Barbara Boxer also won.

Republicans led in 37 of the 58 counties and Democrats in 21. The largest, Los Angeles, cast 2,299,940 votes and went to the Democrat by 29.7 points. The closest was Alpine, where 38 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
Barbara Boxer won Democratic 5,218,441 52.2%
Carly Fiorina Republican 4,217,366 42.2%
All other candidates 564,353 5.6%
Total10,000,160

Every county

CountyDemocratRepublicanOthersTotalMargin
Los Angeles 1,432,450 62.3% 749,353 32.6% 118,137 2,299,940 D+29.7
San Diego 389,806 43.5% 454,301 50.7% 52,699 896,806 R+7.2
Orange 323,477 37.1% 502,756 57.6% 46,102 872,335 R+20.6
Santa Clara 320,734 63.3% 161,986 32.0% 24,261 506,981 D+31.3
Riverside 195,418 40.6% 255,738 53.2% 29,888 481,044 R+12.5
Alameda 338,632 73.9% 100,989 22.0% 18,798 458,419 D+51.8
San Bernardino 185,164 42.6% 216,441 49.8% 32,765 434,370 R+7.2
Sacramento 210,164 50.3% 181,300 43.4% 26,042 417,506 D+6.9
Contra Costa 206,270 59.7% 123,934 35.9% 15,285 345,489 D+23.8
San Francisco 213,252 80.0% 43,108 16.2% 10,218 266,578 D+63.8
Ventura 115,337 44.7% 128,619 49.9% 14,040 257,996 R+5.1
San Mateo 146,537 66.5% 65,803 29.8% 8,182 220,522 D+36.6
Fresno 74,705 37.4% 113,583 56.9% 11,210 199,498 R+19.5
Sonoma 116,996 64.2% 53,678 29.5% 11,493 182,167 D+34.8
Kern 51,364 29.9% 106,448 62.0% 13,900 171,712 R+32.1
San Joaquin 70,031 44.4% 76,342 48.4% 11,267 157,640 R+4.0
Placer 47,331 33.5% 84,905 60.1% 9,032 141,268 R+26.6
Santa Barbara 64,771 49.7% 58,817 45.2% 6,678 130,266 D+4.6
Stanislaus 47,158 39.5% 63,814 53.5% 8,280 119,252 R+14.0
Solano 64,658 55.1% 45,995 39.2% 6,779 117,432 D+15.9
Marin 78,236 69.3% 31,001 27.5% 3,687 112,924 D+41.8
San Luis Obispo 44,799 42.7% 53,695 51.2% 6,412 104,906 R+8.5
Monterey 58,574 59.0% 34,721 35.0% 5,908 99,203 D+24.0
Santa Cruz 65,049 68.5% 24,065 25.4% 5,809 94,923 D+43.2
Tulare 24,742 30.6% 50,856 62.8% 5,319 80,917 R+32.3
El Dorado 25,085 32.7% 46,771 60.9% 4,904 76,760 R+28.3
Butte 27,827 37.0% 40,958 54.4% 6,465 75,250 R+17.4
Shasta 17,204 26.4% 43,056 66.1% 4,911 65,171 R+39.7
Yolo 34,925 58.9% 21,263 35.9% 3,097 59,285 D+23.0
Humboldt 27,081 54.5% 18,659 37.6% 3,931 49,671 D+17.0
Merced 19,058 40.2% 25,280 53.3% 3,088 47,426 R+13.1
Napa 26,194 56.1% 17,743 38.0% 2,737 46,674 D+18.1
Nevada 18,504 40.8% 23,875 52.7% 2,961 45,340 R+11.8
Madera 10,308 30.3% 21,413 62.9% 2,325 34,046 R+32.6
Mendocino 19,422 61.5% 9,426 29.8% 2,732 31,580 D+31.7
Imperial 14,802 55.6% 9,887 37.1% 1,938 26,627 D+18.5
Kings 7,816 29.9% 16,362 62.7% 1,931 26,109 R+32.7
Sutter 8,121 31.8% 15,606 61.1% 1,794 25,521 R+29.3
Tuolumne 7,430 33.3% 13,057 58.6% 1,803 22,290 R+25.2
Lake 10,265 49.0% 8,534 40.7% 2,155 20,954 D+8.3
Tehama 5,352 26.5% 12,950 64.2% 1,864 20,166 R+37.7
Calaveras 6,294 32.0% 11,495 58.5% 1,860 19,649 R+26.5
Siskiyou 6,132 33.6% 10,430 57.2% 1,683 18,245 R+23.6
Amador 5,137 31.8% 9,617 59.6% 1,387 16,141 R+27.8
Yuba 5,212 32.3% 9,452 58.6% 1,471 16,135 R+26.3
San Benito 7,909 49.6% 6,977 43.8% 1,050 15,936 D+5.8
Lassen 2,200 23.9% 6,127 66.6% 871 9,198 R+42.7
Plumas 2,934 32.0% 5,521 60.2% 709 9,164 R+28.2
Mariposa 2,593 31.7% 4,939 60.4% 646 8,178 R+28.7
Del Norte 3,212 39.3% 4,240 51.9% 715 8,167 R+12.6
Glenn 2,020 25.5% 5,257 66.3% 653 7,930 R+40.8
Inyo 2,353 33.8% 3,909 56.1% 700 6,962 R+22.3
Trinity 2,029 37.0% 2,813 51.4% 636 5,478 R+14.3
Colusa 1,567 30.2% 3,288 63.4% 333 5,188 R+33.2
Mono 1,898 43.4% 2,188 50.1% 283 4,369 R+6.6
Modoc 787 20.8% 2,666 70.6% 324 3,777 R+49.7
Sierra 529 29.0% 1,135 62.2% 160 1,824 R+33.2
Alpine 282 50.8% 244 44.0% 29 555 D+6.8

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

California Senate elections we hold

YearWinnerMargin
2024 Adam B. Schiff (D) D+17.7
2022 Alex Padilla (D) D+22.1
2018 Dianne Feinstein (D) D+54.2
2016 Kamala Harris (D) D+61.6
2012 Dianne Feinstein (D) D+25.0
2010 Barbara Boxer (D) D+10.0
2006 Dianne Feinstein (D) D+24.4
2004 Barbara Boxer (D) D+19.9
2000 Dianne Feinstein (D) D+19.3
1998 Barbara Boxer (D) D+10.0
1994 Dianne Feinstein (D) D+1.9
1992 Barbara Boxer (D) D+4.9
1988 Pete Wilson (R) R+8.8
1986 Alan Cranston (D) D+1.4
1982 Pete Wilson (R) R+6.8
1980 Alan Cranston (D) D+19.4
1976 S. I. Hayakawa (R) R+3.3
1974 Alan Cranston (D) D+24.3
1970 John V. Tunney (D) D+9.5
1968 Alan Cranston (D) D+4.9
1964 George Murphy (R) R+3.1
1962 Thomas Kuchel (R) R+12.9
1958 Clair Engle (D) D+14.1
1956 Thomas Kuchel (R) R+8.3
1952 William Knowland (R) R+87.8
1950 Richard M. Nixon (R) R+18.5
1946 William F. Knowland (R) R+9.9
1944 Sheridan Downey (D) D+4.6
1940 Hiram W. Johnson (R) R+82.5
1938 Sheridan Downey (D) D+9.8
1934 Hiram Johnson (R) R+94.5
1932 William Gibbs McAdoo (D) D+12.6
1928 Hiram W. Johnson (R) R+55.9
1926 Samuel M. Shortridge (R) R+26.2
1922 Hiram W. Johnson (R) R+38.4
1920 Samuel M. Shortridge (R) R+8.3
1916 Hiram W. Johnson (R) R+31.6
1914 James D. Phelan (D) D+2.9