My thoughts on the candidates
First, the Republicans, and first of them, Ron Paul. Since I've self-identified as libertarian and can still be fairly accurately identified as one, one would assume that I like him. There are things I admire about him, but he has huge problems. For one he can't possibly win, but that's beside the point. He also denies evolution, has a sketchy stance on abortion, and I'm not fond of his immigration beliefs. And he takes libertarianism to impractical places; most of the stuff he says he'd want to do just wouldn't be possible, and I'm not entirely convinced some of it is wise. That's why I don't like Ron Paul.
As for the rest, Huckabee is an idiot, and just about the worst possible candidate. Giuliani is also terrible, his ideas about executive power are just absurd. Romney is the definition of a person who'll do/say anything to get power. The only one that's even respectable is McCain, and he's switched stances to pander as well as made extremely hypocritical statements. Besides that, his policy stances aren't anything to be happy about: at this point supporting the Iraq war is just lunacy.
As for the Democrats, the closest one to my actual beliefs is Kucinich, but since he has no shot I'll stick to the main three. Honestly, I know very little about each of them, somehow that information just doesn't get into my news sources. Nonetheless, I'll jot down some thoughts. Hillary seems like she just wants power, she's been a bit too supportive of Bush insanity in the past, and frankly I don't trust her. Obama seems genuine, as does his talk about change, even if it is vague. He has made statements supportive of science, and as far as I've heard he has few terrible policies (although the NY Times editorial page has complained about his health care proposal several times, I'd imagine anything that would get passed would be about the same regardless of the President). Finally, Edwards also seems to genuinely want some kind of change, and he certainly talks the talk about being above corporate influence, but who really knows if he is? At the very least, he's more savvy than four years ago, and would probably fair better than Kerry in the games leading up to the general election.
So who do I support? I'll vote for whoever the Democrats put forward, but right now I'm hoping that'll be Obama or Edwards. In fact, and Obama/Edwards ticket would be fairly attractive to me, with either of them in either role. But it's so hard to predict, based on platitudes and inanities and very, very little substantive discussion, who is actually right for the job and what will happen under their leadership. I suppose we'll just have to wait and see.