Okay, here's the thing about Pennsylvania. In my opinion, it won't change anything, no matter how it's spun.
Let's say that Clinton wins as she likely will in Pennsylvania....what's she gonna do, pick up like 10 delegates on Obama? Right now he's up by around 144 total delegates including superdelegates. So losing 10 drops his total to 134. Next up is North Carolina where he currently has a
15.7% lead. That means that out of the 134 pledged delegates there, he could pick up around 20 more, erasing Hillary's gain of 10 and then adding 10 more to his lead putting him up by 154 delegates overall. Beyond that, there are no big delegate states left. So Hillary is done. She can't win unless Obama makes a mistake like coming out saying that white people are the devil and he likes kidnapping and cooking up babies for dinner. Short of that, this nomination race is over.