Is it too early to start the lulz? Take your guess!
Some possibilities I see:
Biden-Most 2 term VPs make a go of it, or in this case a fail of it.
H. Clinton-she's damaged goods, but owed a lot by the machine.
B. Clinton-Is it legal? Define is. He could actually win.
Susan Rice- Very possible, they need another minority to avoid looking like they are going back to plantation leadership, a woman too! More importantly, part of the organization that installed Obama and has such awesome leadership cred.
(Well, at least more awesome than his.)
Michelle Obama-I am waiting for the first leftist pundit to float that balloon, it will happen.
Barack Obama-Living document and all pesky amendments be damned.
Finally, some faceless blue dog like Manchin who runs as the anti-Obama centrist, maybe the smart money. Of course Bill Clinton could run that gig too.