Petri

Tom Petri has been the most mainstream of Wisconsin's 5 conservative congressmen. First elected in 1979, he's generally considered a "moderate" in Congress and has been part of Steve Israel's Center Aisle caucus of Blue Dogs and mainstream Republicans. This has also guaranteed that he wouldn't face any serious challenges from Democrats while Israel ran the DCCC.

Everybody likes inoffensive, friendly, old Tom Petri, right? He's the 4th most senior Republican in the House-- having beaten Tommy Thompson for an open GOP seat back in 1979. His central Wisconsin district is a swing district that leans red. Obama eked out the narrowest of victories there in 2008 and lost to Romney in 2012.