Broadcast: Midmorning, 04/22/2008, 9:06 a.m.
After more than a month of criss-crossing the Keystone state, Barack Obama and Hillary Clinton are headed for one more primary vote. Analysts view this latest contest as a test of Clinton's support among blue collar voters.
- Julian Zelizer: professor of history and public affairs at Princeton University.
- Larry Eichel: senior writer for the Philadelphia Inquirer.
- David Barker: associate professor of political science at the University of Pittsburgh.
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