By Leonard Doyle

Scranton, Pennsylvania is ground zero for Hillary as she tries to keep her presidential hopes alive. Her supporters were out in force this morning, packing into a Scottish Rite Masonic Hall that is now a ballroom to hear her final pep talk. Obama's supporters were out in force the night before.

A huge jump in the number of Democratic voter registrations across Pennsylvania bodes well for Obama as he continues to eat into Hillary's lead. Its an expectations game now and if he deny's her a double digit victory he will have robbed her of the knockout margin she desperately needs to justofy staying in the primary battle. Expect to hear a chorus of calls for her to pull out if she does not achieve a crushing victory.

"I’m not predicting a win. I’m predicting it’s going to be close and that we are going to do a lot better than people expect," says Obama. Listen to the (audio).