President Barack Obama waves as he walks from Air Force One to an awaiting Marine One helicopter at Detroit Metropolitan Airport, Saturday, May 1, 2010, in Romulus, Mich. President Obama is heading to Ann Arbor, Mich. to give the commencement address at the University of Michigan's football stadium, the first sitting President at the Big House since George H. W. Bush in 1991. (AP Photo/Tony Ding)