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Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, left, stands with his wife Ann, during a campaign stop on Saturday, March 17, 2012 in Bayamon, Puerto Rico. People in the U.S. territory don't pay taxes and can't vote in U.S. presidential elections. But they can vote in primary nominating contests, and Republicans will hold their's in Puerto Rico on Sunday. (AP Photo/Evan Vucci)

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