Dem Casten upsets Roskam to flip Illinois House seat

Dem Casten upsets Roskam to flip Illinois House seat

Sean Casten, a clean-energy executive, pulled off a major upset Tuesday, unseating six-term GOP Rep. Peter Roskam Peter James RoskamIllinois New Members 2019 Defeated Republicans mocked by Trump fire back at president House GOP returns to Washington after sobering midterm losses MORE in Illinois's 6th Congressional District.

It was one of the most hotly-contested races in the country, with Democrats making the seat one of their top targets.

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The wealthy suburban Chicago district has traditionally leaned red and Roskam handily won reelection in 2016. But the district also voted for Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonIf Mueller's report lacks indictments, collusion is a delusion Conservatives wage assault on Mueller report The wisdom of Trump's lawyers, and the accountability that must follow Mueller's report MORE by 7 points that year.

Polls showed Casten with a slight edge over the incumbent in the days leading up to the vote. The Cook Political Report also put the race in the "Lean Democratic" column and Democrats outspent Republicans in the race.

In an election that has widely been seen as a referendum on President TrumpDonald John TrumpMueller report findings could be a 'good day' for Trump, Dem senator says Trump officials heading to China for trade talks next week Showdown looms over Mueller report MORE, Roskam also found himself under attack over his role in helping pass the Republican tax law. Roskam sits on the powerful House Ways and Means Committee, which writes tax laws.