"I find serving in the House to be obnoxious," he told a Detroit newspaper.
Businessman Eugene Yu's decision crowds the GOP field against Rep. Barrow.
The slim GOP advantage so far isn't what Republicans had hoped for in the swing district.
Rep. Mike Simpson (R-Idaho) is facing a Club for Growth-backed primary challenger.
Democrats' House campaign arm raised $6.8 million compared to the GOP's $6.1 million.
Rep. Tim Bishop (D-N.Y.) takes heat for a congressional ethics investigation.
Rev. Horace Sheffield says he'll run against the longtime Democratic congressman.
The disgraced former Democratic Louisiana governor and his wife are sending mixed messages.
Lesli Gooch is jumping in the uphill race to replace retiring Rep. Gary Miller.
Rep. Carolyn McCarthy (D-N.Y.) announced her retirement earlier this year.