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      Data: MIT Election Lab, VEST, Census Bureau
      Home/Elections/1978/US Senate/Iowa
      1978·US Senate·Iowa

      Iowa US Senate

      Winner
      REP
      Roger W. Jepsen
      51.1%421,598 votes
      Runner-up
      DEM
      Richard Clark
      47.9%395,066 votes
      Margin
      R+3.2
      824,654 total votes
      3 candidates824,654 total votes
      CandidatePartyVotes ▼%Vote Share
      Roger W. JepsenREP✓
      		REP421,59851.1%
      Richard ClarkDEM
      		DEM395,06647.9%
      OtherOTH
      		OTH7,9901.0%

      Seat History

      US Senate in Iowa(Class I)

      2022
      Charles E GrassleyREP
      R+12.2
      2020
      Joni K ErnstREP
      R+6.6
      2016
      Charles E GrassleyREP
      R+24.4
      2014
      Joni K ErnstREP
      R+8.3
      2010
      Charles E GrassleyREP
      R+31.1
      2008
      Tom HarkinDEM
      D+25.4
      2004
      Charles E GrassleyREP
      R+42.3
      2002
      Tom HarkinDEM
      D+10.4
      1998
      Charles E GrassleyREP
      R+37.9
      1996
      Tom HarkinDEM
      D+5.1
      1992
      Charles E GrassleyREP
      R+42.4
      1990
      Tom HarkinDEM
      D+9.1
      1986
      Charles E GrassleyREP
      R+32.5
      1984
      Tom HarkinDEM
      D+11.8
      1980
      Charles E GrassleyREP
      R+8.0
      View all US Senate history for Iowa →

      Candidates

      Richard ClarkDEM
      Record13W-7L
      Avg MarginD+29.1
      Career1968-2016
      State Senate / State House / US Senate
      Full profile →
      Roger W. JepsenREP
      Record1W-1L
      Avg MarginD+4.3
      Career1978-1984
      US Senate
      Full profile →

      Also in Iowa, 1978

      US House6 contests →Governor1 contest →
      ← All 1978 US Senate races1978 overviewIowa profileAll elections