The 1978 United States Senate election in Iowa took place on November 7, 1978. Incumbent Democratic Senator Dick Clark ran for re-election to a second term but was defeated by Republican former Lieutenant Governor Roger Jepsen. This was the last time until 2014 that a Republican would win Iowa's class 2 Senate seat.
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County results Jepsen: 40–50% 50-60% 60-70% 70-80% Clark: 40–50% 50–60% 60–70% | |||||||||||||||||
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Party | Candidate | Votes | % | |
---|---|---|---|---|
Democratic | Dick Clark (incumbent) | 87,880 | 80.48% | |
Democratic | Gerald Leo Baker | 13,132 | 12.03% | |
Democratic | Robert L. Nereim | 8,176 | 7.49% | |
Write-in | All others | 3 | 0.00% | |
Total votes | 109,191 | 100.00% |
Following his defeat, Gerald Leo Baker announced an independent campaign for the general election.
Party | Candidate | Votes | % | |
---|---|---|---|---|
Republican | Roger Jepsen | 87,397 | 57.33% | |
Republican | Maurie Van Nostrand | 54,189 | 35.55% | |
Republican | Joe Bertroche | 10,860 | 7.12% | |
Total votes | 284,047 | 100.00% |
Party | Candidate | Votes | % | ±% | |
---|---|---|---|---|---|
Republican | Roger Jepsen | 421,598 | 51.12% | 7.03 | |
Democratic | Dick Clark (incumbent) | 395,066 | 47.91% | 7.16 | |
Independent | Gerald Leo Baker | 4,223 | 0.51% | N/A | |
Libertarian | Ben L. Olson | 3,689 | 0.45% | N/A | |
Write-in | All others | 78 | 0.01% | N/A | |
Total votes | 824,654 | 100.00% | |||
Republican gain from Democratic | Swing |