Peter Roskam, left, and Sean Casten
Democrat Sean Casten has been declared the winner in the 6th Congressional District against Republican incumbent Peter Roskam.
With 77 percent of the precincts reporting, Casten had 53 percent of the vote with a total of 128,286 votes.
Roskan received 47 percent of the vote with a total of 113,914 votes.
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