Sean Casten vows to bring accountability to the nation's capital if he's elected. The Downers Grove Democrat, who is running against Republican incumbent Peter Roskam for Illinois' 6th Congressional District seat, talked to the Northwest Herald Editorial Board on Tuesday morning. Casten said Roskam, of Wheaton, enables President Donald Trump. "My opponent votes with Donald Trump 94 percent of the time, votes with his party 97 percent of the time.