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Summary: , Virginia. Obama is expected to announce his Vice Presidential candidate before the start of the Democratic National Convention on August 25th. (Photo by Joe Raedle/Getty Images) GREENSBORO, NC - AUGUST 20: Presumptive Democratic Presidential candidate U.S. Sen. Barack Obama (D-IL) holds a sunflower during a visit to the Greensboro Farmers Curb Market August 20, 2008

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