Idaho Senate - Winner: Republican Sen. Mike Crapo GOP incumbent Michael Crapo coasted to re-election with no Democratic opponent. He was the first senator to run without a major party opponent in the predominantly Republican state of Idaho. His Democratic challenger, engineer Scott McClure, missed the filing date by a matter of minutes and ran as a write-in candidate. Crapo served as a leading state senator until a successful bid for U.S. Congress in 1992. When former Sen. Dirk Kempthorne came back to Idaho in 1998 to run for governor, Crapo won the open seat and his first senatorial bid by 65 percent. House: Idaho has two House districts. Both Republican incumbents won re-election. One of them, Butch Otter, was widely seen as using his re-election campaign as a tuneup for a 2006 run for governor.