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 RoskamBottom line Lobbying world House votes to temporarily repeal Trump SALT deduction cap 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 ClintonHillicon Valley: QAnon scores wins, creating GOP problem | Supreme Court upholds regulation banning robocalls to cellphones | Foreign hackers take aim at homebound Americans | Uber acquires Postmates The Hill's Campaign Report: Trump's job approval erodes among groups that powered his 2016 victory Gallup: Trump's job approval rating erodes among key groups 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 TrumpCNN's Anderson Cooper: Trump's Bubba Wallace tweet was 'racist, just plain and simple' Beats by Dre announces deal with Bubba Wallace, defends him after Trump remarks Overnight Defense: DOD reportedly eyeing Confederate flag ban | House military spending bill blocks wall funding 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.