The Hill's poll examined 12 congressional districts held by first-term Democratic lawmakers. All 12 are considered in tough reelection campaigns. In the seven races that moved, all the Democrats trailed their GOP challengers by various margins.
Here are the seven Democrats that moved catagories: Reps. Ann Kirkpatrick (Ariz.), Betsy Markey (Colo.), Debbie Halvorson (Ill.), Mary Jo Kilroy (Ohio), Kathy Dahlkemper (Pa.), Glenn Nye (Va.), and Tom Perriello (Va.).
The Hill's poll showed Halvorson in the toughest race, down by 18 points. Perriello was in the closest, only down by one point, but he's losing independent voters to his GOP challenger.