David Plouffe, campaign manager for Barack Obama poses in his Chicago campaign headquarters, Thursday, May 10, 2007. The 2008 presidential race is notable for the presence of a woman and a black among the top Democratic candidates. But progress is much slower when it comes to diversifying the ranks of top decision-makers within the various campaigns. (AP Photo/Charles Rex Arbogast) ORG XMIT: WX103
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