President Obama waves upon arrival in Cartagena, Colombia, on Friday, April 13, 2012, to attend the sixth Summit of the Americas. At right is Michael McKinley, U.S. ambassador to Colombia. (AP Photo/Dolores Ochoa)

Photo by: Dolores Ochoa

President Obama waves upon arrival in Cartagena, Colombia, on Friday, April 13, 2012, to attend the sixth Summit of the Americas. At right is Michael McKinley, U.S. ambassador to Colombia. (AP Photo/Dolores Ochoa)