U.S. President Barack Obama waves as he poses for a picture alongside U.S. First Lady Michelle Obama, second right, Senegalese President Macky Sall, right, and Senegalese First Lady Mariame Faye Sall at the presidential palace in Dakar, Senegal, Thursday, June 27, 2013. (AP Photo/Rebecca Blackwell)

Photo by: Rebecca Blackwell

U.S. President Barack Obama waves as he poses for a picture alongside U.S. First Lady Michelle Obama, second right, Senegalese President Macky Sall, right, and Senegalese First Lady Mariame Faye Sall at the presidential palace in Dakar, Senegal, Thursday, June 27, 2013. (AP Photo/Rebecca Blackwell)