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

Mark Kirk (Republican) beat Alex Giannoulias (Democrat) in Illinois in 2010, 48.0% to 46.4%, a margin of 1.6 points and 59,220 votes.

Mark Kirk (Republican) beat Alexi Giannoulias (Democrat) in Illinois in 2010, 47.3% to 46.3%, a margin of 1.0 point and 36,243 votes. (This was a special election.)

Illinois changed party: in 2004 it went Democratic, for Barack Obama.

Republicans led in 98 of the 102 counties and Democrats in 4. The largest, Cook, cast 1,397,353 votes and went to the Democrat by 32.7 points. The closest was Jackson, where 7 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
Mark Kirk won Republican 1,778,698 48.0%
Alex Giannoulias Democratic 1,719,478 46.4%
All other candidates 206,297 5.6%
Total3,704,473

Special election

CandidatePartyVotesShare
Mark Kirk won Republican 1,677,729 47.3%
Alexi Giannoulias Democratic 1,641,486 46.3%
All other candidates 226,769 6.4%
Total3,545,984

Every county

CountyDemocratRepublicanOthersTotalMargin
Cook 898,751 64.3% 442,029 31.6% 56,573 1,397,353 D+32.7
DuPage 106,429 37.3% 163,875 57.5% 14,672 284,976 R+20.2
Lake 78,569 38.7% 114,971 56.6% 9,635 203,175 R+17.9
Will 78,787 41.2% 100,616 52.7% 11,670 191,073 R+11.4
Kane 47,486 37.5% 70,621 55.8% 8,383 126,490 R+18.3
McHenry 30,889 32.9% 55,831 59.5% 7,062 93,782 R+26.6
Madison 32,575 40.0% 44,152 54.2% 4,774 81,501 R+14.2
St. Clair 38,512 47.9% 38,185 47.5% 3,746 80,443 D+0.4
Winnebago 29,144 36.3% 44,622 55.5% 6,588 80,354 R+19.3
Sangamon 25,248 34.9% 42,169 58.4% 4,832 72,249 R+23.4
Champaign 20,205 38.1% 29,321 55.2% 3,551 53,077 R+17.2
Peoria 19,751 37.8% 28,797 55.1% 3,688 52,236 R+17.3
McLean 15,448 29.7% 32,958 63.3% 3,676 52,082 R+33.6
Rock Island 20,445 44.3% 23,249 50.3% 2,509 46,203 R+6.1
Tazewell 12,765 28.2% 28,825 63.7% 3,655 45,245 R+35.5
Macon 12,938 35.5% 21,072 57.9% 2,405 36,415 R+22.3
LaSalle 12,826 38.0% 18,278 54.2% 2,644 33,748 R+16.2
Kankakee 12,037 37.1% 18,277 56.3% 2,139 32,453 R+19.2
Kendall 10,797 35.3% 17,633 57.7% 2,126 30,556 R+22.4
DeKalb 10,633 37.4% 15,389 54.2% 2,393 28,415 R+16.7
Adams 5,124 21.7% 17,525 74.3% 937 23,586 R+52.6
Vermilion 6,309 28.3% 14,078 63.3% 1,870 22,257 R+34.9
Williamson 7,320 33.2% 13,197 59.8% 1,560 22,077 R+26.6
Whiteside 7,005 37.4% 10,473 55.9% 1,251 18,729 R+18.5
Henry 5,653 31.6% 11,034 61.7% 1,185 17,872 R+30.1
Ogle 4,261 25.2% 11,184 66.2% 1,457 16,902 R+41.0
Knox 6,081 36.7% 9,389 56.7% 1,093 16,563 R+20.0
Grundy 5,814 35.1% 9,418 56.9% 1,322 16,554 R+21.8
Jackson 7,443 45.5% 7,436 45.4% 1,485 16,364 level
Macoupin 6,182 38.4% 8,823 54.8% 1,103 16,108 R+16.4
Boone 4,408 29.9% 9,029 61.2% 1,327 14,764 R+31.3
Coles 3,985 27.1% 9,629 65.4% 1,101 14,715 R+38.4
Stephenson 4,174 28.7% 8,711 59.9% 1,666 14,551 R+31.2
Woodford 2,734 19.8% 10,022 72.6% 1,049 13,805 R+52.8
Franklin 5,222 40.2% 6,636 51.1% 1,121 12,979 R+10.9
Effingham 2,378 18.5% 9,518 74.2% 924 12,820 R+55.7
Clinton 3,364 26.6% 8,623 68.2% 653 12,640 R+41.6
Bureau 4,180 33.4% 7,452 59.5% 884 12,516 R+26.1
Livingston 2,894 23.4% 8,575 69.4% 884 12,353 R+46.0
Christian 4,037 32.9% 7,072 57.7% 1,147 12,256 R+24.8
Jefferson 3,799 31.1% 7,580 62.1% 827 12,206 R+31.0
Monroe 3,536 30.0% 7,854 66.5% 414 11,804 R+36.6
Marion 3,966 33.9% 7,071 60.4% 678 11,715 R+26.5
Fulton 4,612 40.2% 5,761 50.2% 1,097 11,470 R+10.0
Randolph 4,358 38.3% 6,168 54.2% 864 11,390 R+15.9
Lee 3,072 28.3% 6,869 63.4% 897 10,838 R+35.0
Morgan 3,101 28.9% 6,818 63.5% 814 10,733 R+34.6
Iroquois 1,871 18.0% 7,763 74.6% 769 10,403 R+56.6
Montgomery 3,351 35.3% 5,427 57.2% 706 9,484 R+21.9
McDonough 2,859 31.4% 5,656 62.1% 587 9,102 R+30.7
Logan 1,959 22.4% 6,105 69.7% 693 8,757 R+47.3
Shelby 1,936 24.0% 5,401 67.0% 725 8,062 R+43.0
Jo Daviess 2,546 32.0% 4,859 61.1% 545 7,950 R+29.1
Saline 2,668 34.1% 4,528 57.9% 630 7,826 R+23.8
Jersey 2,450 32.5% 4,569 60.7% 508 7,527 R+28.2
Perry 2,754 37.5% 3,960 53.9% 631 7,345 R+16.4
Crawford 1,682 24.8% 4,724 69.6% 383 6,789 R+44.8
Hancock 1,641 24.3% 4,647 68.8% 462 6,750 R+44.5
Edgar 1,664 24.7% 4,699 69.6% 386 6,749 R+45.0
Piatt 1,569 23.4% 4,582 68.4% 549 6,700 R+45.0
Fayette 1,711 25.6% 4,571 68.3% 412 6,694 R+42.7
Mercer 2,321 35.0% 3,806 57.4% 508 6,635 R+22.4
Wayne 1,201 18.5% 4,922 75.9% 365 6,488 R+57.4
Union 2,347 36.3% 3,658 56.6% 458 6,463 R+20.3
Douglas 1,263 20.0% 4,624 73.1% 436 6,323 R+53.2
Pike 1,696 27.4% 4,067 65.6% 438 6,201 R+38.2
Clark 1,635 27.1% 4,125 68.3% 281 6,041 R+41.2
Warren 1,883 31.8% 3,654 61.7% 388 5,925 R+29.9
Washington 1,494 26.3% 3,833 67.6% 343 5,670 R+41.3
De Witt 1,356 24.1% 3,791 67.3% 488 5,635 R+43.2
Bond 1,791 33.0% 3,219 59.3% 415 5,425 R+26.3
White 1,466 28.4% 3,407 65.9% 298 5,171 R+37.5
Carroll 1,425 27.8% 3,290 64.2% 406 5,121 R+36.4
Richland 1,270 25.2% 3,501 69.4% 276 5,047 R+44.2
Lawrence 1,535 30.7% 3,198 64.0% 261 4,994 R+33.3
Menard 1,268 26.2% 3,190 65.9% 380 4,838 R+39.7
Mason 1,571 32.7% 2,753 57.2% 485 4,809 R+24.6
Massac 1,453 30.2% 3,129 65.1% 223 4,805 R+34.9
Moultrie 1,241 26.0% 3,189 66.8% 346 4,776 R+40.8
Clay 1,185 25.0% 3,256 68.8% 293 4,734 R+43.7
Ford 823 17.9% 3,441 74.9% 332 4,596 R+57.0
Johnson 1,157 25.4% 3,094 67.8% 313 4,564 R+42.4
Greene 1,326 30.9% 2,591 60.4% 375 4,292 R+29.5
Marshall 1,106 26.0% 2,679 63.0% 469 4,254 R+37.0
Cumberland 944 22.4% 2,916 69.2% 355 4,215 R+46.8
Jasper 1,112 28.5% 2,606 66.7% 187 3,905 R+38.3
Wabash 974 25.4% 2,645 69.0% 213 3,832 R+43.6
Cass 1,190 31.3% 2,305 60.6% 311 3,806 R+29.3
Hamilton 1,146 34.4% 1,910 57.3% 277 3,333 R+22.9
Henderson 1,279 38.4% 1,837 55.2% 213 3,329 R+16.8
Schuyler 844 29.2% 1,830 63.2% 221 2,895 R+34.1
Pulaski 1,155 42.8% 1,429 52.9% 116 2,700 R+10.1
Alexander 1,358 50.4% 1,179 43.7% 158 2,695 D+6.6
Putnam 846 37.3% 1,241 54.7% 181 2,268 R+17.4
Calhoun 937 42.2% 1,140 51.4% 143 2,220 R+9.1
Edwards 353 16.1% 1,685 76.8% 156 2,194 R+60.7
Gallatin 880 42.1% 1,013 48.4% 199 2,092 R+6.4
Brown 514 24.9% 1,411 68.3% 140 2,065 R+43.4
Hardin 719 36.3% 1,133 57.2% 129 1,981 R+20.9
Pope 602 30.9% 1,242 63.7% 105 1,949 R+32.8
Stark 464 24.3% 1,250 65.4% 197 1,911 R+41.1
Scott 440 25.2% 1,203 68.9% 102 1,745 R+43.7

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

Illinois Senate elections we hold

YearWinnerMargin
2022 Tammy Duckworth (D) D+15.3
2020 Richard J Durbin (D) D+16.0
2016 Tammy Duckworth (D) D+15.1
2014 Dick Durbin (D) D+10.9
2010 Mark Kirk (R) R+1.6
2008 Richard J. Durbin (D) D+39.3
2004 Barack Obama (D) D+42.9
2002 Richard J. Durbin (D) D+22.3
1998 Peter G. Fitzgerald (R) R+2.9
1996 Richard J. Durbin (D) D+15.4
1992 Carol Moseley-Braun (D) D+10.2
1990 Paul Simon (D) D+30.1
1986 Alan J. Dixon (D) D+31.4
1984 Paul Simon (D) D+1.9
1980 Alan J. Dixon (D) D+13.5
1978 Charles H. Percy (R) R+7.9
1974 Adlai Stevenson III (D) D+24.9
1972 Charles H. Percy (R) R+24.9
1968 Everett Dirksen (R) R+6.4
1966 Charles H. Percy (R) R+11.0
1962 Everett Dirksen (R) R+5.7
1960 Paul H. Douglas (D) D+9.4
1956 Everett Dirksen (R) R+8.4
1954 Paul H. Douglas (D) D+7.1
1950 Everett Dirksen (R) R+8.1
1948 Paul H. Douglas (D) D+10.5
1944 Scott W. Lucas (D) D+5.6
1942 C. Wayland Brooks (R) R+6.8
1938 Scott W. Lucas (D) D+3.0
1936 James H. Lewis (D) D+15.8
1932 William H. Dieterich (D) D+6.2
1930 James H. Lewis (D) D+33.3
1926 Frank L. Smith (R) R+3.7
1924 Charles S. Deneen (R) R+28.2
1920 William B. McKinley (R) R+40.0
1918 Medill McCormick (R) R+5.6
1914 Lawrence Y. Sherman (R) R+1.7