Nebraska: Chuck Hagel made it official; he is retiring at the end of this term. I doubt we'll see a Democratic primary; I think Omaha Mayor Mike Fahey will defer to former Senator Bob Kerrey if Kerrey runs, or run himself if Kerrey doesn't. The Republican side, however, should see a heated primary with names like Bruning, Flynn, Raimondo, Daub, and Johanns.
Idaho: Larry Craig has filed papers to have his guilty plea withdrawn. In the meantime, I'll operate under Craig's staff's doctrine of "expect a resignation at the end of the month unless we hear something new to the contrary." (Given Craig's back-and-forth consideration over legal maneuvering, I'm surprised no enterprising blogger has Photoshopped Craig's face over Kevin Kline's for an "In & Out" parody graphic.)
Virginia: Will popular former Governor Mark Warner enter the 2008 Senate race on Thursday?
Colorado: Backwards Bob Schaffer will face another significant hiccup in his 2008 Senate race: a Republican primary opponent in the person of Delta County Commissioner Wayne Wolf. Good times.
SSP's James L. looks at Governors' success rates running for Senate, especially salient with former Governors Bob Kerrey (NE), Jeanne Shaheen (NH), and Mark Warner (VA) all considering Senate bids for 2008. James finds that, over the ten cycles from '86 to '04, Governors have an almost two-thirds rate of victory.