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      Data: MIT Election Lab, VEST, Census Bureau
      Home/Elections/1998/US Senate/Iowa
      1998·US Senate·Iowa

      Iowa US Senate

      Winner
      REP
      Charles E Grassley
      68.4%648,480 votes
      Runner-up
      DEM
      David Osterberg
      30.5%289,049 votes
      Margin
      R+37.9
      947,907 total votes
      3 candidates947,907 total votes
      CandidatePartyVotes ▼%Vote Share
      Charles E GrassleyREP✓
      		REP648,48068.4%
      David OsterbergDEM
      		DEM289,04930.5%
      OtherOTH
      		OTH10,3781.1%

      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
      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

      Charles E GrassleyREP
      Record12W-0L
      Avg MarginR+31.8
      Career1970-2022
      US Senate / US House / State House
      Full profile →
      David OsterbergDEM
      Record6W-1L
      Avg MarginD+18.4
      Career1982-1998
      US Senate / State House
      Full profile →

      Also in Iowa, 1998

      US House5 contests →Governor1 contest →
      ← All 1998 US Senate races1998 overviewIowa profileAll elections