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WASHINGTON, DC - APRIL 16: Former Republican presidential candidate Herman Cain speaks at the "Cain's Revolution on the Hill" Tax Day Rally at the U.S. Capitol April 16, 2012 in Washington, DC. Cain spent the day promoting his 9-9-9 tax code plan in advance of tomorrow, the day that Americans are required to file their income taxes this year. (Photo by Win McNamee/Getty Images)
