Sen. Carl Levin, D-Mich, talks on a cell phone as walks towards Air Force One at Andrews Air Force Base, Md., Friday, July 30, 2010, prior to boarding ahead of President Barack Obama, for a flight to Michigan. (AP Photo/Cliff Owen)

Photo by: Cliff Owen

Sen. Carl Levin, D-Mich, talks on a cell phone as walks towards Air Force One at Andrews Air Force Base, Md., Friday, July 30, 2010, prior to boarding ahead of President Barack Obama, for a flight to Michigan. (AP Photo/Cliff Owen)