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?
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THE MARATHON
Barack Obama: 1,962
Hillary Clinton: 1,777
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Magic Number: 2,025
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NOTE: Above figures include superdelegates, which are estimates and subject to change
THE NOMINEE
John McCain: 1,500
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Magic Number: 1,191
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