I think that if any Democrat can do it, it's Bill White. It's going to be a squeaker, though, and it's all about who has a better ground game. I'm helping with his campaign (just phone banking, nothing major), and they're pretty solid in Austin, but I don't know about the rest of the state. He's pretty strong with Hispanic voters, so that's a good sign, and he's got Houston, Austin, and Dallas locked up - it remains to be seen how he'll do with rural voters, though. It's a good sign that Perry won't debate him, IMO.