** FILE ** President Obama is served his cheeseburger (foreground) as he and Vice President Joseph R. Biden (not pictured) eat lunch at Ray's Hell Burger in Arlington, Va., on Tuesday, May 5, 2009. (AP Photo/Charles Dharapak)

** FILE ** President Obama is served his cheeseburger (foreground) as he and Vice President Joseph R. Biden (not pictured) eat lunch at Ray's Hell Burger in Arlington, Va., on Tuesday, May 5, 2009. (AP Photo/Charles Dharapak)