There's a Condorcet poll for the nomination over at
this voting site.
Hardly anyone has voted in it so far so go vote! I'd love to see how the dailykos community collectively ranks all the candidates.
For those that don't know, the frontend of Condorcet votes are familiar - you simply rank all the candidates numerically.
It's the counting method that is interesting. They simply calculate the head-to-head matchups between all the candidates. The candidate that would beat all other candidates head-to-head is the winner.