At this point, he doesn't have much of a political career left, he was very over hyped and then lost, which generally leads to obscurity.
But I mean, is that fair? He didn't have much of a political career to begin with, and while he may have been "overhyped" (somewhat justifiably IMO), he was deeply constrained in what he could do by the need to be reelected in MA in a Presidential general election year. That's not news to anyone.
Regarding being attacked from the right, that's only to be expected given that he had to buck the party line in his 3 years of votes due to being from MA. He needs to find some way to explain to them, in a way that doesn't come off as John Kerry-esque, that Senator Scott Brown (R-NH) need not be the same as Senator Scott Brown (R-MA).
NB1: I know that some of those to the right are Tea Party hardliners. They will likely be unconvinceable in the primary. But I doubt they'd sit home in the general election.
NB2: I don't think he's a favorite to win at this point or anything, but the commentary in this thread seems overly bearish re: his prospects.
