DETROIT, MI - OCTOBER 21: Republican presidential candidate Herman Cain speaks while unveiling his "Opportunity Zone" economic plan in front of the Michigan Central Station, an abandoned train depot,... more 
DETROIT, MI - OCTOBER 21: Republican presidential candidate Herman Cain speaks while 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) less 
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Getty Images | Photo By Bill Pugliano / Getty Images
Fri, Oct 21, 2011 12:54 PM EDT