President Barack Obama leaves Air Force One upon his arrival at Benito Juarez International Airport in Mexico City, Thursday, May 2, 2013. Obama is traveling on a three-day trip to Mexico an Costa Rica. (AP Photo/Pablo Martinez Monsivais)

Associated Press
President Barack Obama leaves Air Force One upon his arrival at Benito Juarez International Airport in Mexico City, Thursday, May 2, 2013. Obama is traveling on a three-day trip to Mexico an Costa Rica. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama leaves Air Force One upon his arrival at Benito Juarez International Airport in Mexico City, Thursday, May 2, 2013. Obama is traveling on a three-day trip to Mexico an Costa Rica. (AP Photo/Pablo Martinez Monsivais)
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