Former Pennsylvania Sen. Rick Santorum speaks at the Bella Donna Chapel in McKinney, Texas, on Wednesday. Rex C. Curry/Associated Press hide caption

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GOP presidential candidates in South Carolina Monday. Stephen Morton/Getty Images hide caption

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Last March, nine people were killed in a gang shootout in the Pacific resort city of Acapulco, just as spring break was beginning for many U.S. schools. Bernardino Hernandez/AP hide caption

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