"It's a little disturbing that there are superdelegates who seem to need to take some time to think over what the consequences of biting on that one might be, but I'd still put her chances at zero."

I don't think there are many if any supers who are actually taking a long time to ponder that question. More likely, the ones who haven't declared yet are hoping someone else will put Obama over the top so they don't have to go on record as being against the Clintons. Win or lose, the Clintons will remain major power brokers in the Democratic Party, and if you're a politician in need of party support, you don't want the Clintons against you.

Of course, if Obama wins in November, he'll become a power broker in his own right. But Obama is a) more forgiving than the Clintons, and b) a gamble--after all, if he loses to McCain, his star will fall as quickly as it rose.