Campaign buttons are for sale by a vendor outside Mama Lou's restaurant in Robertsdale, Ala., Saturday March 10, 2012, during a campaign stop by Republican presidential candidate and former House Speaker Newt Gingrich. (AP Photo/ John David Mercer)

Associated Press
Campaign buttons are for sale by a vendor outside Mama Lou's restaurant in Robertsdale, Ala., Saturday March 10, 2012, during a campaign stop by Republican presidential candidate and former House Speaker Newt Gingrich. (AP Photo/ John David Mercer)
Campaign buttons are for sale by a vendor outside Mama Lou's restaurant in Robertsdale, Ala., Saturday March 10, 2012, during a campaign stop by Republican presidential candidate and former House Speaker Newt Gingrich. (AP Photo/ John David Mercer)
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