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      Data: MIT Election Lab, VEST, Census Bureau
      Home/Elections/1990/US Senate/Iowa
      1990·US Senate·Iowa

      Iowa US Senate

      Winner
      DEM
      Tom Harkin
      54.5%535,975 votes
      Runner-up
      REP
      Thomas J Tauke
      45.4%446,869 votes
      Margin
      D+9.1
      983,933 total votes
      3 candidates983,933 total votes
      CandidatePartyVotes ▼%Vote Share
      Tom HarkinDEM✓
      		DEM535,97554.5%
      Thomas J TaukeREP
      		REP446,86945.4%
      OtherOTH
      		OTH1,0890.1%

      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
      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

      Tom HarkinDEM
      Record9W-0L
      Avg MarginD+12.3
      Career1976-2008
      US Senate / US House
      Full profile →
      Thomas J TaukeREP
      Record7W-2L
      Avg MarginD+6.2
      Career1974-1990
      US Senate / US House / State House
      Full profile →

      Also in Iowa, 1990

      US House6 contests →Governor1 contest →
      ← All 1990 US Senate races1990 overviewIowa profileAll elections