Autoworkers react to the arrival of President Barack Obama during his visit to the Jefferson North Chrysler Plant in Detroit, Friday, July 30, 2010, where the Jeep Grand Cherokee is assembled. (AP Photo/Pablo Martinez Monsivais)

Photo by: Pablo Martinez Monsivais

Autoworkers react to the arrival of President Barack Obama during his visit to the Jefferson North Chrysler Plant in Detroit, Friday, July 30, 2010, where the Jeep Grand Cherokee is assembled. (AP Photo/Pablo Martinez Monsivais)