Mazeski said she had been motivated to run by the fight in Washington over health care and received a high-profile boost in making the front page of The New York Times, announcing her bid against Roskam on the same day the U.S. House voted to repeal the Affordable Care Act. Democrats consider Roskam, who has helped shape and sell his party’s controversial overhaul of the tax code, as a vulnerable incumbent. They point to the fact that Clinton prevailed by 7 percentage points in the 2016 election over President Donald Trump in Roskam’s district.