Huckabee or Romney will win the primaries on the republican side, Hillary, Obama, or Edwards will win the primaries on the democrat side. Here are all of the combinations I can see possible in the '08 election.

Hillary Vs Romney = Hillary Wins
Obama Vs Romney = Obama Wins
Edwards Vs Romney = Edwards Wins

Hillary Vs Huckabee = Huckabee Wins
Obama Vs Huckabee = Huckabee Wins
Edwards Vs Huckabee = Edwards Wins

I think if the democrats want someone who will win, Edwards is the best pick, as Hillary is a woman and Obama is black and both will be hurt by that. If the republicans want to win, Giulianni is probably their best shot, as I think he would beat any of the three democrats I've listed, but I think it's unlikely he'll be facing any of them. If not Giulianni, Huckabee is their next best pick as far as who will win.

Now, as far as who I WANT to win, Obama. If not Obama, Hillary. If not Hillary, Edwards.