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      Data: MIT Election Lab, VEST, Census Bureau
      Home/Elections/1966/US Senate/Iowa
      1966·US Senate·Iowa

      Iowa US Senate

      Winner
      REP
      John Miller
      60.9%522,339 votes
      Runner-up
      DEM
      E.B. Smith
      37.8%324,114 votes
      Margin
      R+23.1
      857,496 total votes
      3 candidates857,496 total votes
      CandidatePartyVotes ▼%Vote Share
      John MillerREP✓
      		REP522,33960.9%
      E.B. SmithDEM
      		DEM324,11437.8%
      OtherOTH
      		OTH11,0431.3%

      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

      E.B. SmithDEM
      Record0W-2L
      Avg MarginR+14.9
      Career1962-1966
      US Senate
      Full profile →
      John MillerREP
      Record9W-6L
      Avg MarginD+8.1
      Career1889-2006
      State House / US House / US Senate / Governor
      Full profile →

      Also in Iowa, 1966

      Governor1 contest →
      ← All 1966 US Senate races1966 overviewIowa profileAll elections