Bill Johnson, OH-06
After routing five Democrats out of office in 2010, Republicans in slow-growing Ohio are victims of their own success and may need to throw one of their own on the altar. Johnson, who didn't earn the acknowledgment of the NRCC until late in the campaign but upset Democrat Charlie Wilson anyway, represents a narrow strip of the Ohio River Valley and may be the odd Republican out. Still regarded as a bit of a fluke within his own party, Johnson could find himself in a primary against either Rep. Jean Schmidt to the west or fellow freshman Rep. Bob Gibbs to the north.
For more about the redistricting battles, National Journal subscribers can check out Redistricting Central.