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      Data: MIT Election Lab, VEST, Census Bureau
      Home/Elections/1940/US Senate/Illinois
      1940·US Senate·Illinois
      Special

      Illinois US Senate

      Winner
      REP
      C. Wayland Brooks
      50.1%2,045,924 votes
      Runner-up
      DEM
      James M. Slattery
      49.6%2,025,097 votes
      Margin
      R+0.5
      4,086,163 total votes
      3 candidates4,086,163 total votes
      CandidatePartyVotes ▼%Vote Share
      C. Wayland BrooksREP✓
      		REP2,045,92450.1%
      James M. SlatteryDEM
      		DEM2,025,09749.6%
      OtherOTH
      		OTH15,1420.4%

      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

      C. Wayland BrooksREP
      Record2W-2L
      Avg MarginD+3.3
      Career1936-1948
      US Senate / Governor
      Full profile →
      James M. SlatteryDEM
      Record0W-1L
      Avg MarginR+0.5
      Career1940-1940
      US Senate
      Full profile →

      Also in Illinois, 1940

      President1 contest →Governor1 contest →
      ← All 1940 US Senate races1940 overviewIllinois profileAll elections