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U.S. Rep. Mike Quigley faces three challengers in the Democratic primary: Matthew Conroy, Anthony Tamez and Ellen Corley.
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Three Republican candidates seek to flip the 5th Congressional District red: Tommy Hanson, Kimball Ladien and Barry Wicker.
Votes will be counted in contested races after polls close in Illinois at 7 p.m. See statewide election results here. Last minute questions about voting? View our voter guide.