President Barack Obama walks across the South Lawn of the White House in Washington after his arrival from Camp David on Marine One helicopter, Sunday, Aug., 26, 2012. (AP Photo/Pablo M

 

              President Barack Obama walks across the South Lawn of the White House in Washington after his arrival from Camp David on Marine One helicopter, Sunday, Aug., 26, 2012. (AP Photo/Pablo M
President Barack Obama walks across the South Lawn of the White House in Washington after his arrival from Camp David on Marine One helicopter, Sunday, Aug., 26, 2012. (AP Photo/Pablo Martinez Monsivais)