In this April 13, 2008 file photo, then-Democratic presidential hopefuls, Sen. Barack Obama, D-Ill., right, and Sen. Hillary Rodham Clinton, D-N.Y., share the stage at the Compassion Forum held at Messiah College in Grantham, Pa. Obama's campaign announced Friday, June 20, 2008, that he will campaign with his former rival next week, a step toward unifying a fractured Democratic Party after a bruising primary fight. (AP Photo/Jae C. Hong, File)

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