DETROIT, MI — OCTOBER 21: Republican presidential candidate Herman Cain speaks with the news media after unveiling his «Opportunity Zone» economic plan in front of the Michigan Central Station, an abandoned train depot, October 21, 2011 in Detroit, Michigan. Cain has reportedly proposed changes to his «9-9-9» tax plan to exempt taxes for those living at or below the poverty line and businesses investing in «Opportunity Zones» (Photo by Bill Pugliano/Getty Images)