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DENVER - AUGUST 28: A Democratic U.S. Presidential nominee Sen. Barack Obama (D-IL) placard is held up on day four of the Democratic National Convention (DNC) at Invesco Field at Mile High August 28, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) is the first African-American to be officially nominated as a candidate for U.S. president by a major party. (Photo by Spencer Platt/Getty Images)