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United States · Election results history · 1990 Senate · Iowa
Election 1990 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.

1990 US Senate election in Iowa

Tom Harkin (Democrat) beat Thomas J. Tauke (Republican) in Iowa in 1990, 54.5% to 45.4%, a margin of 9.1 points and 89,106 votes.

The Democratic hold continued from 1984, when Tom Harkin also won.

Democrats led in 63 of the 99 counties and Republicans in 36. The largest, Polk, cast 119,469 votes and went to the Democrat by 27.3 points. The closest was Pottawattamie, where 14 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
Tom Harkin won Democratic 535,975 54.5%
Thomas J. Tauke Republican 446,869 45.4%
All other candidates 1,089 0.1%
Total983,933

Every county

CountyDemocratRepublicanOthersTotalMargin
Polk 75,892 63.5% 43,289 36.2% 288 119,469 D+27.3
Linn 33,212 52.3% 30,193 47.5% 142 63,547 D+4.8
Scott 24,704 52.9% 22,023 47.1% 10 46,737 D+5.7
Black Hawk 23,205 54.2% 19,577 45.7% 18 42,800 D+8.5
Johnson 22,027 67.7% 10,420 32.0% 89 32,536 D+35.7
Dubuque 13,939 43.7% 17,964 56.3% 29 31,932 R+12.6
Woodbury 15,595 51.3% 14,486 47.6% 324 30,405 D+3.6
Story 16,068 63.6% 9,198 36.4% 11 25,277 D+27.2
Pottawattamie 11,486 50.0% 11,472 50.0% 1 22,959 D+0.1
Clinton 8,586 47.7% 9,398 52.3% 2 17,986 R+4.5
Cerro Gordo 8,841 50.4% 8,717 49.6% 1 17,559 D+0.7
Des Moines 9,125 59.7% 6,149 40.3% 3 15,277 D+19.5
Marshall 8,628 58.2% 6,174 41.7% 11 14,813 D+16.6
Webster 8,165 58.8% 5,731 41.2% 13,896 D+17.5
Warren 8,865 64.8% 4,822 35.2% 4 13,691 D+29.5
Jasper 8,386 61.3% 5,288 38.6% 14 13,688 D+22.6
Lee 7,697 59.2% 5,301 40.8% 2 13,000 D+18.4
Wapello 8,147 67.0% 4,013 33.0% 1 12,161 D+34.0
Muscatine 5,646 50.4% 5,565 49.6% 1 11,212 D+0.7
Marion 6,015 55.8% 4,773 44.2% 1 10,789 D+11.5
Dallas 6,754 62.9% 3,967 37.0% 15 10,736 D+26.0
Sioux 8,568 79.8% 2,164 20.2% 10,732 D+59.7
Boone 6,109 64.3% 3,392 35.7% 9,501 D+28.6
Fayette 4,112 45.8% 4,861 54.2% 2 8,975 R+8.3
Bremer 4,071 50.1% 4,051 49.9% 1 8,123 D+0.2
Benton 4,381 54.4% 3,675 45.6% 1 8,057 D+8.8
Hardin 4,328 56.2% 3,364 43.7% 8 7,700 D+12.5
Mahaska 3,499 46.1% 4,086 53.9% 7,585 R+7.7
Kossuth 3,251 44.4% 4,067 55.6% 7,318 R+11.2
Jackson 3,309 45.4% 3,982 54.6% 5 7,296 R+9.2
Buchanan 3,591 49.3% 3,694 50.7% 5 7,290 R+1.4
Winneshiek 3,564 49.0% 3,710 51.0% 7,274 R+2.0
Carroll 3,401 47.0% 3,831 52.9% 4 7,236 R+5.9
Plymouth 3,106 43.1% 4,100 56.8% 6 7,212 R+13.8
Buena Vista 3,523 49.3% 3,622 50.7% 7,145 R+1.4
Clayton 3,218 45.1% 3,914 54.9% 1 7,133 R+9.8
Jones 3,300 47.5% 3,647 52.5% 4 6,951 R+5.0
Poweshiek 4,077 60.1% 2,707 39.9% 6,784 D+20.2
Tama 3,642 55.6% 2,909 44.4% 6,551 D+11.2
Delaware 2,474 38.4% 3,966 61.6% 6,440 R+23.2
Henry 3,360 52.5% 3,040 47.5% 6,400 D+5.0
Washington 3,107 50.6% 3,037 49.4% 1 6,145 D+1.1
Cedar 2,977 49.0% 3,100 51.0% 4 6,081 R+2.0
Hamilton 3,420 56.4% 2,648 43.6% 6,068 D+12.7
Cass 2,737 45.3% 3,303 54.6% 5 6,045 R+9.4
Floyd 3,108 51.4% 2,928 48.5% 5 6,041 D+3.0
Clay 3,160 53.2% 2,778 46.8% 1 5,939 D+6.4
Dickinson 2,779 48.3% 2,969 51.7% 5,748 R+3.3
Iowa 2,918 51.4% 2,758 48.6% 1 5,677 D+2.8
Cherokee 2,958 52.3% 2,697 47.7% 1 5,656 D+4.6
Jefferson 2,962 52.5% 2,682 47.5% 3 5,647 D+5.0
O'Brien 2,140 38.5% 3,424 61.5% 5,564 R+23.1
Crawford 2,807 50.7% 2,733 49.3% 1 5,541 D+1.3
Allamakee 2,048 39.0% 3,207 61.0% 5,255 R+22.1
Page 1,799 34.5% 3,409 65.5% 5,208 R+30.9
Chickasaw 2,725 52.4% 2,464 47.4% 8 5,197 D+5.0
Madison 1,893 36.7% 3,259 63.2% 5 5,157 R+26.5
Butler 2,026 40.0% 3,045 60.0% 5,071 R+20.1
Winnebago 2,160 43.5% 2,809 56.5% 1 4,970 R+13.1
Wright 2,550 52.2% 2,328 47.7% 3 4,881 D+4.5
Shelby 1,939 40.3% 2,877 59.7% 4,816 R+19.5
Union 2,908 60.5% 1,895 39.5% 4,803 D+21.1
Grundy 1,916 40.6% 2,803 59.4% 4,719 R+18.8
Hancock 2,706 58.4% 1,918 41.4% 8 4,632 D+17.0
Appanoose 2,616 57.4% 1,943 42.6% 4,559 D+14.8
Harrison 2,100 46.3% 2,437 53.7% 1 4,538 R+7.4
Greene 2,744 61.6% 1,706 38.3% 1 4,451 D+23.3
Mitchell 1,945 44.2% 2,460 55.8% 4,405 R+11.7
Keokuk 2,436 55.6% 1,942 44.4% 4,378 D+11.3
Humboldt 2,210 50.8% 2,142 49.2% 4,352 D+1.6
Franklin 2,165 50.8% 2,094 49.2% 4,259 D+1.7
Calhoun 2,183 51.8% 2,034 48.2% 4,217 D+3.5
Palo Alto 2,128 51.8% 1,982 48.2% 4,110 D+3.6
Guthrie 2,496 60.9% 1,605 39.1% 4,101 D+21.7
Sac 1,968 48.5% 2,088 51.5% 4,056 R+3.0
Lyon 1,204 29.7% 2,846 70.3% 4,050 R+40.5
Howard 1,850 46.6% 2,117 53.3% 3 3,970 R+6.7
Montgomery 1,528 38.6% 2,424 61.3% 4 3,956 R+22.6
Emmet 1,914 49.2% 1,977 50.8% 1 3,892 R+1.6
Mills 1,560 40.6% 2,282 59.4% 3,842 R+18.8
Louisa 2,027 53.9% 1,733 46.0% 4 3,764 D+7.8
Adair 2,139 57.7% 1,562 42.2% 3 3,704 D+15.6
Pocahontas 1,866 51.2% 1,782 48.8% 3,648 D+2.3
Lucas 2,231 62.5% 1,336 37.4% 2 3,569 D+25.1
Worth 1,660 47.6% 1,826 52.3% 3 3,489 R+4.8
Clarke 2,262 65.1% 1,212 34.9% 3 3,477 D+30.2
Monona 1,832 54.2% 1,544 45.7% 2 3,378 D+8.5
Audubon 1,814 54.5% 1,513 45.5% 3,327 D+9.0
Fremont 1,386 42.7% 1,859 57.3% 3,245 R+14.6
Monroe 1,988 61.5% 1,243 38.5% 1 3,232 D+23.1
Ida 1,587 51.0% 1,524 49.0% 1 3,112 D+2.0
Davis 1,942 63.4% 1,118 36.5% 3 3,063 D+26.9
Taylor 1,708 56.1% 1,338 43.9% 3,046 D+12.1
Decatur 1,909 65.1% 1,024 34.9% 1 2,934 D+30.2
Van Buren 1,465 50.4% 1,440 49.5% 3 2,908 D+0.9
Wayne 1,901 66.4% 961 33.6% 2 2,864 D+32.8
Osceola 989 39.1% 1,539 60.9% 2,528 R+21.8
Ringgold 1,581 62.7% 942 37.3% 2,523 D+25.3
Adams 1,031 52.8% 921 47.2% 1,952 D+5.6

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

Iowa Senate elections we hold

YearWinnerMargin
2022 Chuck Grassley (R) R+12.2
2020 Joni Ernst (R) R+6.6
2016 Chuck Grassley (R) R+24.4
2014 Joni Ernst (R) R+8.3
2010 Chuck Grassley (R) R+31.0
2008 Tom Harkin (D) D+25.4
2004 Charles E. Grassley (R) R+42.3
2002 Tom Harkin (D) D+10.4
1998 Charles E. Grassley (R) R+37.9
1996 Tom Harkin (D) D+5.1
1992 Chuck Grassley (R) R+42.4
1990 Tom Harkin (D) D+9.1
1986 Charles E. Grassley (R) R+32.5
1984 Tom Harkin (D) D+11.8
1980 Charles E. Grassley (R) R+7.9
1978 Roger W. Jepsen (R) R+3.2
1974 John C. Culver (D) D+4.8
1972 Dick Clark (D) D+11.0
1968 Harold E. Hughes (D) D+0.6
1966 Jack Miller (R) R+23.1
1962 Bourke Hickenlooper (R) R+6.8
1960 Jack Miller (R) R+3.8
1956 Bourke Hickenlooper (R) R+7.8
1954 Thomas E. Martin (R) R+4.7
1950 Bourke Hickenlooper (R) R+10.1
1948 Guy M. Gillette (D) D+16.2
1944 Bourke Hickenlooper (R) R+2.9
1942 George A. Wilson (R) R+16.3
1938 Guy M. Gillette (D) D+0.3
1936 Clyde L. Herring (D) D+3.4
1932 Richard L. Murphy (D) D+13.9
1930 Lester Dickinson (R) R+13.3
1926 Smith W. Brookhart (R) R+13.2
1924 Smith W. Brookhart (R) R+0.1
1920 Albert B. Cummins (R) R+24.0
1918 William S. Kenyon (R) R+30.8
1914 Albert B. Cummins (R) R+9.0