Ralph Sharper, center, and Jason Claybrook, right, with the Service Employees International Union speak with Tina Caldwell at her home while campaigning for Democratic presidential hopeful Sen. Barack Obama D-Ill in Philadelphia, Tuesday, March 25, 2008. All around Pennsylvania, union members like Claybrook and Sharper are working their friends, families and complete strangers trying to secure votes for Clinton or Barack Obama in the upcoming April 22 Democratic presidential primary. (AP Photo/Matt Rourke)

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