Neither Obama or Hillary can win enough delegates thru the primaries. The superdelegates will decide the nomination. And Hillary can make the argument that she can win the big states (CA, NY, OH, MI, FL, and I think she will also win PA). The elected party leaders will move to her, and Obama will get the VP nod. I don't think this fight will go to the convention, and look for the Democrats to unite after the PA primary on April 22nd.
You would still be going against the voters. It won’t happen. Clinton might be offered the VP- not Obama.