President Barack Obama waves as he boards Air Force One before his departure from Andrews Air Force Base, Md., Thursday, May 2, 2013. Obama is traveling on a three-day trip to Mexico and Costa Rica. (AP Photo/Pablo Martinez Monsivais)

Associated Press
President Barack Obama waves as he boards Air Force One before his departure from Andrews Air Force Base, Md., Thursday, May 2, 2013. Obama is traveling on a three-day trip to Mexico and Costa Rica. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama waves as he boards Air Force One before his departure from Andrews Air Force Base, Md., Thursday, May 2, 2013. Obama is traveling on a three-day trip to Mexico and Costa Rica. (AP Photo/Pablo Martinez Monsivais)
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