Meh. I'd do more Democratic candidates but I'm just doing the ones everyone seems to be talking about. I could do Edwards but I didn't like Edwards last time he was running and I don't like him now, and that's only partially because almost no one who wants to go into the medical field or is in it now likes him because he was once an ambulance chaser.
I think if the Republican party runs McCain or Romney, most voters will go Democrat. They are too reminiscent of Bush and the neocons. I'd vote Clinton or Obama over them, of course. If they run Giuliani, the Dems may have a challenge. They'll probably run Clinton, she's more popular.
Giuliani vs. Clinton: Could go either way, but there might be a knee-jerk NOT REPUBLICAN vote for Clinton. Also could be a knee-jerk NOT HILLARY vote for Giuliani. I'd probably vote for Giuliani just because Congress will be Democratic and Clinton + Democratic Congress = WAY too much power.
Giuliani vs. Obama: Obama is a pro-war Democrat who doesn't really seem to understand fiscal policy. Giuliani is a socially liberal Republican. There may be a knee-jerk NOT REPUBLICAN vote for Obama but then again a lot of people vote Republican by default even still. I would debate it a lot and likely go with Obama, because he hasn't come out in favor of executive authority like Giuliani, and because I think I disagree with Obama a little bit less than I disagree with Giuliani, which is a depressing thing to vote about.
I don't really agree with any of the candidates. I really want someone who pushes for spending cuts and peace talks, who gets along with other countries even if he or she ideologically disagrees with them. Someone who wants to focus on the deficit first and foremost, and once spending is cut in other areas, THEN will start to implement other programs. Someone who is socially liberal but who will leave most issues up to the states unless doing so involves the restriction of human rights.