MARTINSVILLE, VA - AUGUST 20: Presumptive Democratic Presidential candidate U.S. Sen. Barack Obama (D-IL) listens as former Vir
MARTINSVILLE, VA - AUGUST 20: Presumptive Democratic Presidential candidate U.S. Sen. Barack Obama (D-IL) listens as former Virginia Gov. Mark R. Warner introduces him to speak during a campaign event at the Patrick Henry Community College August 20, 2008 in Martinsville, 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)
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