The city of Pittsburgh from atop Mt. Washington April 20, 2008 in Pittsburgh, Pennsylvania. Both Democratic presidential hopefuls, Sen. Hillary Clinton (D-NY) and Sen. Barack Obama (D-IL), are contending for the victory in the crucial state's primary, to be held on April 22. (Photo by Jeff Swensen/Getty Images)
Pennsylvania primary
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.
Guests
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Julian Zelizer: professor of history and public affairs at Princeton University.
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Larry Eichel: senior writer for the Philadelphia Inquirer.
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David Barker: associate professor of political science at the University of Pittsburgh.
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