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US businessman Herman Cain (L) and Minnesota Rep. Michele Machmann (R) listen as former House speaker Newt Gingrich speaks during the Republican presidential debate on national security November 22, 2011 at the Daughters of the American Revolution (DAR) Constitution Hall in Washington, DC. The debate is hosted by CNN in partnership with the Heritage Foundation and the American Enterprise Institute. AFP PHOTO / Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
US businessman Herman Cain (L) and Minnesota Rep. Michele Machmann (R) listen as former House speaker Newt Gingrich speaks during the Republican presidential debate on national security November 22, 2011 at the Daughters of the American Revolution (DAR) Constitution Hall in Washington, DC. The debate is hosted by CNN in partnership with the Heritage Foundation and the American Enterprise Institute. AFP PHOTO / Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

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