President Barack Obama, center, talks about American football to European world leaders during the NATO family photo at Soldier Field at the NATO Summit in Chicago, Sunday, May 20, 2012. (AP Photo/Pablo Martinez Monsivais)

Associated Press
President Barack Obama, center, talks about American football to European world leaders during the NATO family photo at Soldier Field at the NATO Summit in Chicago, Sunday, May 20, 2012. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama, center, talks about American football to European world leaders during the NATO family photo at Soldier Field at the NATO Summit in Chicago, Sunday, May 20, 2012. (AP Photo/Pablo Martinez Monsivais)