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

      South Dakota US Senate

      Winner
      REP
      Karl E. Mundt
      66.3%150,517 votes
      Runner-up
      DEM
      Donn H. Wright
      33.7%76,563 votes
      Margin
      R+32.6
      227,080 total votes
      2 candidates227,080 total votes
      CandidatePartyVotes ▼%Vote Share
      Karl E. MundtREP✓
      		REP150,51766.3%
      Donn H. WrightDEM
      		DEM76,56333.7%

      Seat History

      US Senate in South Dakota(Class I)

      2022
      John R ThuneREP
      R+43.5
      2020
      Michael RoundsREP
      R+31.5
      2016
      John R ThuneREP
      R+43.7
      2014
      Michael RoundsREP
      R+20.9
      2010
      John R ThuneREP
      R+100.0
      2008
      Timothy V JohnsonDEM
      D+25.0
      2004
      John R ThuneREP
      R+1.1
      2002
      Timothy V JohnsonDEM
      D+0.2
      1998
      Thomas A DaschleDEM
      D+25.7
      1996
      Timothy V JohnsonDEM
      D+2.6
      1992
      Thomas A DaschleDEM
      D+32.4
      1990
      Larry PresslerREP
      R+7.3
      1986
      Thomas A DaschleDEM
      D+3.2
      1984
      Larry PresslerREP
      R+49.0
      1980
      James AbdnorREP
      R+18.8
      View all US Senate history for South Dakota →

      Candidates

      Donn H. WrightDEM
      Record0W-1L
      Avg MarginR+32.6
      Career1966-1966
      US Senate
      Full profile →
      Karl E. MundtREP
      Record4W-0L
      Avg MarginR+17.7
      Career1948-1966
      US Senate
      Full profile →

      Also in South Dakota, 1966

      Governor1 contest →
      ← All 1966 US Senate races1966 overviewSouth Dakota profileAll elections