Don’t be too sure. Remember, with the Clintons it’s all about winning. Whatever it takes. And if they think that would guarantee victory, they’d do it.
I don't see this happening. Hillary has plenty of baggage. Obama only adds more.
90%+ of Blacks will vote for the Democrat in the end, no matter who is the nominee. He adds no votes there.
Illinois will almost certainly go for the Dems. He adds nothing there.
I don't know what else Obama would bring to the table to help Hillary except perhaps the "likeability" factor. But that would serve to upstage Hillary and she would not tolerate that.
I'd expect her to pick someone like Richardson. Edwards would be a possibilty, but would she really pick a two time loser who can't even win his home state?