He takes aim at race-poverty link and outshines Clinton, others DETROIT -- Sen. Barack Obama is indeed a quick study. After looking surprisingly unpolished in a nationally televised forum targeting black audiences nearly two weeks ago, Obama held his own against his closest rival, Sen. Hillary Clinton, at the 98th NAACP National Convention at Cobo Hall in Detroit on Thursday morning. Obama, who is pitting change against experience in the 2008 Democratic primary, got off more than a few crisp one-liners while crafting a message that at times elicited thunderous applause that drowned out some of his words, but obviously...