Bachmann and Perry ought to pack it in as well. Actually, I suspect the reason they are still in is simply that they think they might get the nod for VP if they can make a dent in the polls. Right now, they are probably hoping they’ll pick up some of Herman’s support. That seems like a pipe dream to me.
I think it’s really going to be a two man race, maybe 3 with Ron Paul a distant 3d. If Santorum’s going to make a move, it’s gotta be quick. He’s a more credible VP, however, than any of the others I think.