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 ClintonDemocrat Katie Porter unseats GOP's Mimi Walters Former Facebook security chief: 'I failed to prepare my employer' on Russian disinformation Rand Paul: Facebook must 'convince conservatives they're not the enemy' 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 TrumpAvenatti ‘still considering’ presidential run despite domestic violence arrest Mulvaney positioning himself to be Commerce Secretary: report Kasich: Wouldn’t want presidential run to ‘diminish my voice’ 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.