After Pennsylvania: Now What?

It ain't over — again. Hillary Clinton pulls out a win in Pennsylvania and sends Barack Obama and superdelegates a double-digit message: Don't count me out.

And so, the battle for the Democratic nomination goes on, and on, and on, and on. In two weeks, primaries in Indiana and North Carolina.

On paper, the math and money favor Obama. Less clear now is which candidate has the mojo and momentum, and what the superdelegates are thinking.

This hour, On Point: the big news out of Pennsylvania and what it means for the Democrats.Guests:

Celinda Lake, Democratic strategist, president of Lake Research Partners, and author of "What Women Want."

Ruth Marcus, editorial writer and columnist for The Washington Post.

Mark Halperin, editor-at-large and senior political analyst at Time magazine, he writes the campaign blog The Page.

Jack Beatty, On Point news analyst and senior editor at The Atlantic Monthly.