US President Barack Obama waves as he boards Air Force One before his departure from Benito Juarez International Airport in Mexico City, Friday, May 3, 2013, en route to Costa Rica. (AP Photo/Pablo Martinez Monsivais)

Associated Press
US President Barack Obama waves as he boards Air Force One before his departure from Benito Juarez International Airport in Mexico City, Friday, May 3, 2013, en route to Costa Rica. (AP Photo/Pablo Martinez Monsivais)
US President Barack Obama waves as he boards Air Force One before his departure from Benito Juarez International Airport in Mexico City, Friday, May 3, 2013, en route to Costa Rica. (AP Photo/Pablo Martinez Monsivais)
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