Good posts, Tom Bombadil.
Thucy, I have to disagree that Willingham will be an issue. First, and less important, once you let both sides talk awhile it becomes pretty unclear whether he should be viewed as guilty or not, so Perry's mistake looks at most like slightly bad judgment.
Second, and more important, even if Willingham's case were crystal clear, these things never have the effect we (as opponents of a particular candidate) hope. I understand this well, as over the years, there have been all kinds of things that seemed, once I learned of them, like they would be sure-fire killers to the candidate I didn't like, but no, people just ignored them or brushed them off. It's easy for you, as someone who dislikes Perry, to see this as something nobody could know and still vote for him. My best guess, from following politics pretty closely for 20 years, is that people will just ignore it. It's too individual, one-story; the kind of mistake people will forgive.
I could be wrong, obviously. Also, I'm not saying what SHOULD happen. Just that I think that while it's _possible_ (but unlikely) that that would derail Perry's bid, it's DEFINITELY overconfident to assert that it certainly will.
OP: I think the Republican -- probably Perry, though not necessarily, if Palin runs and (potentially) hands it to Romney -- will probably win, but it's my no means certain. If you look at the electoral map, the path isn't THAT clear. I think the GOP retakes FLA, NC, and VA, probably, but that still leaves them (as usual) needing OH and one more (maybe NV?). Possible but by no means certain. Ohio's never easy.