Can you imagine being the vice president in a White House with not one, but TWO, President Clintons? Talk about marginalized. Hillary doesn't need or want a runnning mate, she already has one. They just want Obama to tote their baggage to the WH for them. They will do to him what the Bushes did to Colin Powell...use him to do their dirty work(i.e., force him to clean up the mess they are making in the party by accepting VP if they manage to steal it)...then, if, God help him, they actually win in November, they will spend their the next 4 years using the space between his shoulder blades for target practice.
If they Clinton's manage to force the Party to give them the nomination over Obama, don't think they won't try to punish him for making them have to actually break a sweat to get this nomination and then, ultimately, having to steal it. And, what better way than to keep him close? So they can surround him with his and her Clinton loyalists. No VP in the history of VP's will have been so damaged by the time they get through.