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DES MOINES, IA - JULY 4: Democratic presidential hopeful Barack Obama is joined by his wife Michelle and daughters, Malia and Sasha at a campaign event, July 4, 2007 in Des Moines, Iowa. The U.S. senator from Illinois, who is on a two-day campaign swing through Iowa, recently announced that his campaign had raised $32.5 million in the second quarter, outpacing rival Sen. Hillary Clinton (D-NY), who pulled in $20 million. (Photo by Charles Ommanney/Getty Images)