Iowa — 1978 U.S. Senate election
Recent presidential results
Akashicstate1978 Senate electionIowa · U.S. SenateJepsenR+3.2
How it voted
Share of the 1978 vote
| Roger W. Jepsen ✓Republican | 51.1% | 421,598 |
|---|---|---|
| Dick ClarkDemocrat | 47.9% | 395,066 |
| Gerald Leo BakerIndependent | 0.5% | 4,223 |
1978Senate margin
D+60R+60
99 counties, each filled by 1978 D-vs-R margin. Hover any county for its result.
County-level results (99 counties) — table
| County | Winner | Margin |
|---|---|---|
| ADAIR, IA | Republican | R+7.7 |
| ADAMS, IA | Republican | R+6.7 |
| ALLAMAKEE, IA | Republican | R+35.4 |
| APPANOOSE, IA | Republican | R+5.5 |
| AUDUBON, IA | Democratic | D+1.6 |
| BENTON, IA | Republican | R+2.7 |
| BLACK HAWK, IA | Republican | R+7.7 |
| BOONE, IA | Democratic | D+8.7 |
| BREMER, IA | Republican | R+28.5 |
| BUCHANAN, IA | Republican | R+13.1 |
| BUENA VISTA, IA | Republican | R+6.7 |
| BUTLER, IA | Republican | R+40.8 |
| CALHOUN, IA | Republican | R+5.9 |
| CARROLL, IA | Democratic | D+2.6 |
| CASS, IA | Republican | R+23.0 |
| CEDAR, IA | Republican | R+9.7 |
| CERRO GORDO, IA | Republican | R+7.7 |
| CHEROKEE, IA | Democratic | D+3.1 |
| CHICKASAW, IA | Republican | R+13.0 |
| CLARKE, IA | Democratic | D+2.3 |
| CLAY, IA | Republican | R+4.2 |
| CLAYTON, IA | Republican | R+7.9 |
| CLINTON, IA | Republican | R+3.4 |
| CRAWFORD, IA | Republican | R+8.5 |
| DALLAS, IA | Democratic | D+9.5 |
| DAVIS, IA | Democratic | D+0.8 |
| DECATUR, IA | Democratic | D+9.9 |
| DELAWARE, IA | Republican | R+12.8 |
| DES MOINES, IA | Democratic | D+10.2 |
| DICKINSON, IA | Republican | R+12.4 |
| DUBUQUE, IA | Democratic | D+1.0 |
| EMMET, IA | Democratic | D+0.03 |
| FAYETTE, IA | Republican | R+12.1 |
| FLOYD, IA | Republican | R+5.6 |
| FRANKLIN, IA | Republican | R+17.2 |
| FREMONT, IA | Republican | R+12.8 |
| GREENE, IA | Democratic | D+1.7 |
| GRUNDY, IA | Republican | R+38.4 |
| GUTHRIE, IA | Democratic | D+0.4 |
| HAMILTON, IA | Republican | R+12.2 |
| HANCOCK, IA | Republican | R+24.2 |
| HARDIN, IA | Republican | R+12.1 |
| HARRISON, IA | Republican | R+5.7 |
| HENRY, IA | Republican | R+1.8 |
| HOWARD, IA | Republican | R+15.2 |
| HUMBOLDT, IA | Republican | R+14.0 |
| IDA, IA | Republican | R+14.5 |
| IOWA, IA | Republican | R+11.5 |
| JACKSON, IA | Republican | R+1.6 |
| JASPER, IA | Republican | R+4.1 |
| JEFFERSON, IA | Republican | R+19.9 |
| JOHNSON, IA | Democratic | D+33.5 |
| JONES, IA | Republican | R+4.5 |
| KEOKUK, IA | Republican | R+2.4 |
| KOSSUTH, IA | Republican | R+6.4 |
| LEE, IA | Democratic | D+9.3 |
| LINN, IA | Republican | R+1.3 |
| LOUISA, IA | Republican | R+10.9 |
| LUCAS, IA | Republican | R+8.0 |
| LYON, IA | Republican | R+36.4 |
| MADISON, IA | Democratic | D+1.4 |
| MAHASKA, IA | Republican | R+18.3 |
| MARION, IA | Republican | R+6.3 |
| MARSHALL, IA | Republican | R+17.1 |
| MILLS, IA | Republican | R+27.4 |
| MITCHELL, IA | Republican | R+12.5 |
| MONONA, IA | Republican | R+5.6 |
| MONROE, IA | Democratic | D+1.1 |
| MONTGOMERY, IA | Republican | R+31.7 |
| MUSCATINE, IA | Republican | R+14.9 |
| OBRIEN, IA | Republican | R+28.1 |
| OSCEOLA, IA | Republican | R+24.4 |
| PAGE, IA | Republican | R+33.0 |
| PALO ALTO, IA | Democratic | D+2.4 |
| PLYMOUTH, IA | Republican | R+25.8 |
| POCAHONTAS, IA | Republican | R+10.4 |
| POLK, IA | Democratic | D+14.5 |
| POTTAWATTAMIE, IA | Republican | R+8.3 |
| POWESHIEK, IA | Republican | R+4.9 |
| RINGGOLD, IA | Republican | R+13.4 |
| SAC, IA | Republican | R+18.5 |
| SCOTT, IA | Republican | R+1.6 |
| SHELBY, IA | Republican | R+20.8 |
| SIOUX, IA | Republican | R+49.4 |
| STORY, IA | Democratic | D+15.9 |
| TAMA, IA | Republican | R+18.3 |
| TAYLOR, IA | Republican | R+17.1 |
| UNION, IA | Republican | R+8.4 |
| VAN BUREN, IA | Republican | R+19.0 |
| WAPELLO, IA | Democratic | D+10.2 |
| WARREN, IA | Democratic | D+11.9 |
| WASHINGTON, IA | Republican | R+9.4 |
| WAYNE, IA | Republican | R+6.8 |
| WEBSTER, IA | Democratic | D+4.8 |
| WINNEBAGO, IA | Republican | R+16.1 |
| WINNESHIEK, IA | Republican | R+20.8 |
| WOODBURY, IA | Republican | R+3.1 |
| WORTH, IA | Republican | R+0.5 |
| WRIGHT, IA | Republican | R+11.0 |
presidential baselinePresident 1976R+1.0Senate 1978R+3.2vs. baselineR+2.2
Iowa's 1978 Senate race ran 2.2 points more Republican than its 1976 presidential margin.
Iowa's Senate margins
Every comparable D–R contest in our store, 1978–2022
| Year | Margin (D minus R) |
|---|---|
| 1978 | −3.2% |
| 1980 | −7.9% |
| 1984 | +11.8% |
| 1986 | −32.5% |
| 1990 | +9.1% |
| 1992 | −42.4% |
| 1996 | +5.1% |
| 1998 | −37.9% |
| 2002 | +10.4% |
| 2004 | −42.3% |
| 2008 | +25.4% |
| 2010 | −31.1% |
| 2014 | −8.3% |
| 2016 | −24.5% |
| 2020 | −6.6% |
| 2022 | −12.2% |
Same ballot, 1978IA
Source. MIT Election Data + Science Lab — 1978 US Senate returns, party-classified by literal ballot party · county returns aggregated from precinct-level results. Real returns — nothing estimated.