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Pennsylvania Governor Edward G. Rendell (L) announces his endorsement of New York Senator and Democratic presidential hopeful Hillary Rodham Clinton (R) as the Democratic presidential candidate 23 January 2008 at Philadelphia City Hall in Philadelphia. AFP PHOTO/Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Pennsylvania Governor Edward G. Rendell (L) announces his endorsement of New York Senator and Democratic presidential hopeful Hillary Rodham Clinton (R) as the Democratic presidential candidate 23 January 2008 at Philadelphia City Hall in Philadelphia.       AFP PHOTO/Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)