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

      Illinois US Senate

      Winner
      REP
      Charles H. Percy
      53.3%1,698,711 votes
      Runner-up
      DEM
      Alex Seith
      45.5%1,448,187 votes
      Margin
      R+7.9
      3,184,764 total votes
      3 candidates3,184,764 total votes
      CandidatePartyVotes ▼%Vote Share
      Charles H. PercyREP✓
      		REP1,698,71153.3%
      Alex SeithDEM
      		DEM1,448,18745.5%
      OtherOTH
      		OTH37,8661.2%

      Seat History

      US Senate in Illinois(Class I)

      2022
      Tammy DuckworthDEM
      D+15.3
      2020
      Richard J DurbinDEM
      D+16.1
      2016
      Tammy DuckworthDEM
      D+15.1
      2014
      Richard J DurbinDEM
      D+10.8
      2010
      Mark Steven KirkREP
      R+1.6
      2008
      Richard J DurbinDEM
      D+39.3
      2004
      Barack ObamaDEM
      D+42.9
      2002
      Richard J DurbinDEM
      D+22.3
      1998
      Peter G FitzgeraldREP
      R+2.9
      1996
      Richard J DurbinDEM
      D+15.4
      1992
      Carol Moseley-BraunDEM
      D+10.2
      1990
      Paul SimonDEM
      D+30.1
      1986
      Alan J. DixonDEM
      D+31.4
      1984
      Paul SimonDEM
      D+1.9
      1980
      Alan J. DixonDEM
      D+13.5
      View all US Senate history for Illinois →

      Candidates

      Alex SeithDEM
      Record0W-1L
      Avg MarginR+7.9
      Career1978-1978
      US Senate
      Full profile →
      Charles H. PercyREP
      Record3W-2L
      Avg MarginR+7.6
      Career1964-1984
      US Senate / Governor
      Full profile →

      Also in Illinois, 1978

      US House24 contests →Governor1 contest →
      ← All 1978 US Senate races1978 overviewIllinois profileAll elections