President Barack Obama waves as he arrives at the Convention Center for the second working session of the sixth Summit of the Americas in Cartagena, Colombia, Sunday April 15, 2012. (AP Photo/Fernando Llano)

Associated Press
President Barack Obama waves as he arrives at the Convention Center for the second working session of the sixth Summit of the Americas in Cartagena, Colombia, Sunday April 15, 2012. (AP Photo/Fernando Llano)
President Barack Obama waves as he arrives at the Convention Center for the second working session of the sixth Summit of the Americas in Cartagena, Colombia, Sunday April 15, 2012. (AP Photo/Fernando Llano)
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