Hillary tried her hardest to talk to those superdelegates at the debate in PA, however, they were not persuaded.
NYT: Superdelegates unswayed by Clinton - The New York Times - MSNBC.com
This is one of the key paragraphs as it proves Superdelegates are moving towards Obama.
In fact, the Obama campaign announced endorsements from two more superdelegates on Thursday, after rolling out three on Wednesday and two others since late last week in what appeared to be a carefully orchestrated show of strength before Tuesday’s Pennsylvania primary. Obama advisers said that one of the pickups on Thursday, Councilman Harry Thomas Jr. of the District of Columbia, had initially favored Mrs. Clinton, but Clinton advisers denied that, and a Thomas aide said he had been neutral before Thursday.