Also, there should be a Democrat version of this thread too. It would be pretty cool. (Of course under the assumption that by some twist of fate the race becomes competitive)
Gore 2000: Clinton
Bradley 2000: Everyone else combined.
Sanders is probably more likely to become the Bradley. Webb and O'Malley will likely fizzle out and become irrelevant. Webb's niche is a dying breed that will at best get him decent showings in Appalachia and Oklahoma. As for O'Malley, who does he really appeal to? I doubt there's very much overlap between the "Hillary is a far right neoliberal warmonger" group and the "Sanders is a socialist? That's SCARY!!!!" group.