Chris Cillizza at washingtonpost.com (the Fix) added Baucus' Senate seat as one to watch this next election cycle, that is, with the caveat his opponent is Rehberg. 

10. Montana: Until we hear Rep. Denny Rehberg (R) say "no," it's hard not to find a place on The Line for this race. From everything we hear, Rehberg isn't likely to run. But if he does perchance get into the race, his candidacy would make Montana one of the most-watched races of the cycle. Sen. Max Baucus (D) has proved resilient despite the state's Republican tilt; he won a fifth term in 2002 with 63 percent of the vote. In a race against Rehberg, however, Baucus would be pushed to his limit. The political junkie in us is rooting for it, but the pragmatist says it's not likely. (Previous ranking: N/A)

Cillizza's not the only political junkie that would look forward to the race, but don't hold your breath. Rehberg is as comfortable with his incumbency as Baucus is with his.  Maybe someone will start a getintheracedenny.com website.