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U.S. Rep. Sean Casten faces one challenger in the Democratic primary: Joseph Ruzevich.
Two Republicans seek to flip the 6th Congressional District red: Niki Conforti and Skylar Duensing.
Votes will be counted in contested races after polls close in Illinois at 7 p.m. See statewide election results here
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. Last minute questions about voting? View our voter guide.