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WALLINGFORD, PA - APRIL 02: Democratic U.S. presidential hopeful Sen. Barack Obama (D-IL) backstage before speaking to supporters during a town hall meeting at Strath Haven High School April 2, 2008 in Wallingford, Pennsylvania. Obama is on his six-day 'Road to Change' bus tour through Pennsylvania to campaign for the upcoming state's primary. (Photo by Charles Ommanney/Getty Images)