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United States · Election results history · 1978 Senate · Iowa
Election 1978 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.

1978 US Senate election in Iowa

Roger W. Jepsen (Republican) beat Dick Clark (Democrat) in Iowa in 1978, 51.1% to 47.9%, a margin of 3.2 points and 26,532 votes.

Iowa changed party: in 1972 it went Democratic, for Dick Clark.

Republicans led in 76 of the 99 counties as they stood then and Democrats in 23. The largest, Polk, cast 87,078 votes and went to the Democrat by 14.5 points. The closest was Emmet, where 1 vote 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
Roger W. Jepsen won Republican 421,598 51.1%
Dick Clark Democratic 395,066 47.9%
All other candidates 7,912 1.0%
Total824,576

Every county

CountyDemocratRepublicanOthersTotalMargin
Polk 49,337 56.7% 36,704 42.2% 1,037 87,078 D+14.5
Linn 22,330 48.5% 22,950 49.8% 766 46,046 R+1.3
Scott 19,125 48.6% 19,735 50.2% 481 39,341 R+1.6
Black Hawk 17,881 45.7% 20,898 53.4% 345 39,124 R+7.7
Dubuque 13,366 49.9% 13,105 48.9% 328 26,799 D+1.0
Woodbury 12,515 48.1% 13,319 51.2% 173 26,007 R+3.1
Johnson 14,962 66.0% 7,375 32.5% 334 22,671 D+33.5
Story 12,899 57.1% 9,311 41.2% 390 22,600 D+15.9
Pottawattamie 8,546 45.6% 10,092 53.9% 95 18,733 R+8.3
Clinton 7,855 47.9% 8,418 51.3% 126 16,399 R+3.4
Webster 7,395 52.1% 6,709 47.2% 99 14,203 D+4.8
Cerro Gordo 6,389 45.8% 7,457 53.4% 107 13,953 R+7.7
Marshall 5,218 40.6% 7,414 57.6% 231 12,863 R+17.1
Des Moines 6,669 54.7% 5,424 44.5% 96 12,189 D+10.2
Wapello 6,149 54.7% 5,005 44.5% 93 11,247 D+10.2
Jasper 5,315 47.6% 5,772 51.7% 82 11,169 R+4.1
Lee 5,506 54.3% 4,558 45.0% 76 10,140 D+9.3
Warren 5,403 55.3% 4,244 43.4% 125 9,772 D+11.9
Sioux 2,132 25.0% 6,333 74.4% 46 8,511 R+49.4
Boone 4,558 54.0% 3,823 45.3% 58 8,439 D+8.7
Fayette 3,645 43.6% 4,657 55.7% 59 8,361 R+12.1
Dallas 4,532 54.3% 3,740 44.8% 76 8,348 D+9.5
Muscatine 3,329 42.0% 4,509 56.9% 93 7,931 R+14.9
Kossuth 3,518 46.6% 4,002 53.0% 24 7,544 R+6.4
Marion 3,421 46.5% 3,882 52.8% 48 7,351 R+6.3
Benton 3,462 48.3% 3,657 51.0% 51 7,170 R+2.7
Mahaska 2,897 40.4% 4,211 58.8% 57 7,165 R+18.3
Clayton 3,202 45.7% 3,755 53.6% 52 7,009 R+7.9
Jones 3,216 47.5% 3,524 52.0% 32 6,772 R+4.5
Plymouth 2,485 36.9% 4,218 62.7% 26 6,729 R+25.8
Buena Vista 3,067 46.0% 3,511 52.7% 89 6,667 R+6.7
Hardin 2,866 43.6% 3,664 55.8% 38 6,568 R+12.1
Buchanan 2,766 43.1% 3,604 56.2% 42 6,412 R+13.1
Jackson 3,051 48.8% 3,152 50.4% 50 6,253 R+1.6
Poweshiek 2,938 47.2% 3,245 52.1% 44 6,227 R+4.9
Bremer 2,191 35.3% 3,961 63.8% 57 6,209 R+28.5
Carroll 3,078 51.1% 2,921 48.5% 27 6,026 D+2.6
Floyd 2,777 46.7% 3,109 52.3% 62 5,948 R+5.6
Tama 2,378 40.0% 3,464 58.3% 103 5,945 R+18.3
Hamilton 2,503 43.4% 3,209 55.6% 55 5,767 R+12.2
Clay 2,702 47.3% 2,940 51.4% 74 5,716 R+4.2
Winneshiek 2,177 39.1% 3,333 59.9% 54 5,564 R+20.8
Cedar 2,317 44.8% 2,817 54.5% 33 5,167 R+9.7
Iowa 2,263 43.9% 2,854 55.4% 38 5,155 R+11.5
Cass 1,958 38.2% 3,136 61.1% 36 5,130 R+23.0
Cherokee 2,536 50.9% 2,384 47.9% 62 4,982 D+3.1
Henry 2,388 48.9% 2,474 50.6% 24 4,886 R+1.8
Page 1,618 33.3% 3,224 66.3% 20 4,862 R+33.0
Appanoose 2,270 46.8% 2,535 52.3% 42 4,847 R+5.5
Chickasaw 2,085 43.3% 2,711 56.3% 18 4,814 R+13.0
Calhoun 2,230 46.5% 2,512 52.4% 55 4,797 R+5.9
Washington 2,089 44.8% 2,526 54.1% 51 4,666 R+9.4
Harrison 2,187 47.1% 2,450 52.7% 8 4,645 R+5.7
Crawford 2,109 45.4% 2,505 54.0% 27 4,641 R+8.5
Delaware 1,988 42.9% 2,579 55.6% 68 4,635 R+12.8
Wright 2,030 44.1% 2,537 55.1% 34 4,601 R+11.0
Madison 2,302 50.5% 2,240 49.1% 20 4,562 D+1.4
Howard 1,852 41.7% 2,525 56.9% 61 4,438 R+15.2
Humboldt 1,895 42.7% 2,515 56.7% 26 4,436 R+14.0
O'Brien 1,573 35.7% 2,809 63.8% 21 4,403 R+28.1
Dickinson 1,898 43.4% 2,441 55.8% 36 4,375 R+12.4
Grundy 1,308 30.5% 2,955 68.9% 28 4,291 R+38.4
Winnebago 1,786 41.8% 2,475 57.9% 13 4,274 R+16.1
Greene 2,144 50.2% 2,071 48.5% 53 4,268 D+1.7
Keokuk 2,034 48.5% 2,135 50.9% 28 4,197 R+2.4
Butler 1,219 29.2% 2,924 70.0% 32 4,175 R+40.8
Jefferson 1,660 39.8% 2,489 59.7% 20 4,169 R+19.9
Shelby 1,626 39.2% 2,491 60.0% 32 4,149 R+20.8
Allamakee 1,326 32.0% 2,793 67.4% 24 4,143 R+35.4
Palo Alto 2,005 50.0% 1,908 47.5% 100 4,013 D+2.4
Mitchell 1,736 43.3% 2,236 55.8% 37 4,009 R+12.5
Guthrie 1,934 49.8% 1,918 49.4% 29 3,881 D+0.4
Union 1,766 45.5% 2,092 53.9% 22 3,880 R+8.4
Emmet 1,874 49.6% 1,873 49.6% 30 3,777 level
Hancock 1,410 37.5% 2,320 61.7% 30 3,760 R+24.2
Montgomery 1,247 33.8% 2,417 65.4% 30 3,694 R+31.7
Pocahontas 1,579 42.8% 1,964 53.2% 146 3,689 R+10.4
Sac 1,478 40.3% 2,159 58.8% 35 3,672 R+18.5
Franklin 1,454 41.1% 2,061 58.3% 20 3,535 R+17.2
Decatur 1,928 54.7% 1,578 44.8% 16 3,522 D+9.9
Adair 1,595 46.0% 1,863 53.8% 6 3,464 R+7.7
Lyon 1,085 31.4% 2,345 67.8% 28 3,458 R+36.4
Monona 1,563 47.0% 1,750 52.7% 9 3,322 R+5.6
Ida 1,410 42.5% 1,892 57.1% 14 3,316 R+14.5
Lucas 1,483 45.5% 1,742 53.5% 32 3,257 R+8.0
Mills 1,153 36.0% 2,030 63.4% 21 3,204 R+27.4
Clarke 1,607 50.9% 1,535 48.6% 16 3,158 D+2.3
Monroe 1,542 50.0% 1,507 48.9% 32 3,081 D+1.1
Worth 1,485 49.5% 1,499 50.0% 15 2,999 R+0.5
Davis 1,492 50.2% 1,467 49.4% 11 2,970 D+0.8
Wayne 1,290 46.3% 1,479 53.0% 20 2,789 R+6.8
Fremont 1,183 43.3% 1,533 56.1% 15 2,731 R+12.8
Taylor 1,103 41.4% 1,559 58.5% 4 2,666 R+17.1
Louisa 1,180 44.3% 1,471 55.3% 11 2,662 R+10.9
Audubon 1,334 50.5% 1,293 48.9% 16 2,643 D+1.6
Adams 1,079 46.6% 1,234 53.3% 3 2,316 R+6.7
Van Buren 923 40.1% 1,360 59.2% 16 2,299 R+19.0
Ringgold 956 43.2% 1,253 56.6% 3 2,212 R+13.4
Osceola 750 37.5% 1,239 61.9% 12 2,001 R+24.4

Counties as they stood in 1978; some have since been split, merged or renamed. 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