I think we are looking at a Clinton/Obama ticket - which will be really hard to beat - since so many voters nowadays seem to have the same attitude as American Idol voters.
As the primary season heats up, that's probably going to be the "dream ticket" that's discussed. However....my feeling is she wouldn't want someone with whom she'd share the spotlight. Also, if he were to get the nomination, she wouldn't want to be subordinate to him....but that's just how I see it.