There were 158 delegates at stake in PA. There are 157 at stake in NC and IN.
According to the New York Times, people are now zeroing in on the Hoosier State as Obama's last chance to sew this thing up:
The Indiana primary, on the same day, poses another make-or-break moment for Mrs. Clinton, according to several of her advisers, who said they would urge her to quit the race if she lost that state. Mrs. Clinton, Mr. Clinton and their allies have campaigned frequently in Indiana in recent weeks, and she has some important endorsements, including support from Senator Evan Bayh, the state’s former governor.
“She has to win Pennsylvania and Indiana — pretty much everyone in the campaign agrees on that,” said one senior Clinton adviser, who spoke on the condition of anonymity to discuss the campaign’s electoral expectations.
Quit the race? It ain't gonna happen, folks. This has gotten so easy to predict: in about a week, after enough polls have been done to give us a sense of who's likely to win Indiana, the Clinton campaign will either say "It all comes down to Indiana" if they're up, or "Indiana doesn't matter; Democrats never win it anyway. Besides, isn't like half of it Chicago?" if they're down.
The only people who can stop this thing are the supers, and they're busy doing what politicians do best: standing in a circle and pointing at the guy to their left.