Obama Hits Clintons on Democratic 'Dream Ticket'

Thurber says the demographic advantages of the ticket would work its magic during the general election, but that "it would very difficult for the Clintons to have Obama, a charismatic figure, as the vice president."

Unlike the "marriage of convenience" between Kennedy and Johnson, Thurber says Clinton-Obama "would be very difficult to bring together because there is not a young charismatic figure that would be number two on the ticket. It would have been like Kennedy being vice president and Johnson being the president."

ABC News Photo Illustration

48 hours remain before the critical primary... View Full Caption

48 hours remain before the critical primary in Pennsylvania. With a multitude of factors at play, only time will tell how this historic and enduring battle for the Democratic nomination will end. Close

Obama allies also think the Clinton trial balloons on a joint ticket are full of hot air.

This weekend on Face the Nation, Kerry, the 2004 Democratic presidential nominee, chastised the Clintons for using conflicting language. "On the one end, they are saying he's not prepared to be president. On the other hand, they're saying maybe he ought to be vice president."

Of course, the more bitter this fight gets, the less likely reconciliation is likely — especially if the nomination is decided after a brutal fight at the Democratic convention.