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KNOXVILLE, IA – DECEMBER 30: Presidential hopeful Senator Barack Obama (D-IL) greets voters following a speech at a town hall style meeting at the Knoxville Middle School auditorium December 30, 2007 in Knoxville, Iowa. Presidential candidates from the Democratic and Republican parties are currently campaigning throughout Iowa trying to win over voters before the January 3 caucus. (Photo by Scott Olson/Getty Images)
