Barack Obama's performance in the Pennsylvania primary will hinge in large part on his ability to connect with blue-collar voters. Can this outsider from Chicago pull it off?
THE MARATHON
Barack Obama: 1,962
Hillary Clinton: 1,777
************ Magic Number: 2,025
************ NOTE: Above figures include superdelegates, which are estimates and subject to change
GOP SCOREBOARD
THE NOMINEE
John McCain: 1,500
************ Magic Number: 1,191
************