On Intrade, the contract "Dropout.June08.Clinton" is currently trading at about 81%. That's about 4:1 odds on a short-sell; it's essentially a bet to see whether or not Clinton drags this thing out to the convention. Doing so would be her best way to damage Obama in the long run. She needs Obama to lose if she is to make a run in 2012.
This might be the most overvalued Intrade stock I've ever seen.