It's not even close to over. If Hillary were playing under Republican rules (the popular vote winner gets the delegates, period), she'd have already won, due to her victories in Ohio, Texas, New Yawk, California, and now Pennsylvania.
But she's playing under Democrat rules, which means there's no clear winner. She'll likely carry Indiana, and Barack has a good chance of landing NC. But this thing is going to the convention, and, if I were to bet, I would bet on the superdelegates giving the nod to the more electable candidate, which is Hillary.
But the party is in some serious doo-doo either way right now. If Hillary steals the bid, Obama's supporters are going to be really upset that the Messiah is not on the ticket. Obama's supporters view Hillary as a representative of the "politics of old," and "against change." (And they're right!) So perhaps some of them stay home.
On the other hand, if Barack gets the nomination, I wonder how many middle-America, church-going, patriotic, gun-owning Democrats will vote for him. I see quite a few of them defecting to McCain, at least enough to influence the outcome in the general.
Conclusion: We can only pray for the good people of Denver when that convention comes, because we know what happens when radical liberals get angry. One group will be leaving very very angry.