What with today sort of being Opening Day and all, I indulged myself over at Post Partisan and wrote about the "Mark Portugal mistake" with regard to Veepstakes. That is, don't overvalue the stuff you've seen in person -- in this case, don't pick your running mate based on who you seemed to get along with on the campaign trail.
Meanwhile, the latest National Journal insiders poll says that Marco Rubio's star is shrinking, while Rob Portman is moving up. Of course, that's all total speculation; the only vote that counts is the one that Mitt Romney will cast, and there's no real way of guessing that. Portman seems like a reasonable choice to me. Granted, he hasn't been vetted through a national campaign, but really only the Huck fits that, and it's not altogether clear he's available, plus there's always the chance that Romney won't want him for some other reason.
As for Portman, he seems relatively safe. He's had a reasonable amount of experience. If you're going to pick a state to get a couple of points of a boost, Ohio is right at the top of the list. I've seen some liberals say that his George W. Bush era stint at OMB will be a problem, what with that administration's fiscal issues, but I find that a pretty obscure line of attack. Now, I'm sure he cast some ugly votes in his fairly long service in the House, but again -- that's not going to matter much for a VP pick.
So Huck still seems like the best choice to me, but Portman isn't bad at all.