It may be imperative that they pair up in order to keep from cratering the party. As neither is likely to concede until very late in the game, a big question remains as to whether they'd be able to mount a sufficiently substantial general campaign in the time remaining after the convention. A lot of Democrats have major heartburn this morning, especially those who created the complex proportionate system and "super" delegates. They'll now be forced to deal with MI and FL. Sucks to be Howard Dean right now.