Illinois judge resigns from seat to run against Rep. Davis

Callis, who was Madison County Circuit Court's chief judge, has been encouraged by Democrats to run in the swing district. She left her position on Friday and is expected to announce a bid against Davis soon.

Davis narrowly beat physician David Gill (D) in 2012, and Democrats were nervous Gill, who'd lost before, would run again. But he was offered a job in state government by Illinois Gov. Pat Quinn (D) and accepted it on Friday, eliminating one potential primary foe for Callis in the district.

The district is a true toss-up: Davis won his race by fewer than 1,000 votes, about the same margin that Mitt Romney won the district by. But he's been off to a quick fundraising start this year and could be tough to beat in a midterm election.