A new Monmouth poll shows GOP incumbent Rep. Barbara Comstock is trailing her Democratic challenger by 10 points.

Why it matters: Nearly half of her constituents think she's done a good job for Virginia's 10th district, but they voted for Hillary Clinton by 10 points in 2016 and now 34% of them think she has been too supportive of President Trump — a sign of how POTUS is becoming a liability for vulnerable incumbent Republicans.