President Barack Obama, followed by Sen. Debbie Stabenow, D-Mich., and Sen. Carl Levin, D-Mich., arrive at Detroit Wayne County Airport in Detroit, Friday, July 30, 2010. (AP Photo/Pablo Martinez Monsivais)
Michigan Gov. Jennifer Granholm, center, and her husband Daniel Mulhearn, left, greet President Barack Obama upon his arrival at Detroit Wayne County Airport in Detroit, Friday, July 30, 2010. (AP Photo/Pablo Martinez Monsivais)
Detroit Mayor Dave Bing greets President Barack Obama upon his arrival at Detroit Wayne County Airport in Detroit, Friday, July 30, 2010. At right is Rep. Carolyn Kilpatrick, D-Mich. (AP Photo/Pablo Martinez Monsivais)
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)
President Barack Obama waves as he is introduced before delivering remarks 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)
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)
President Barack Obama tours the Jefferson North Chrysler Plant in Detroit, Friday, July 30, 2010, where the Jeep Grand Cherokee is assembled. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama examines the car door during his tour of the Jefferson North Chrysler Plant in Detroit, Friday, July 30, 2010, where the Jeep Grand Cherokee is assembled. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama steps out of a Jeep Grand Cherokee during his tour of the Jefferson North Chrysler Plant in Detroit, Friday, July 30, 2010. The is plant is where the Cherokee is assembled. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama addresses employees at the Chrysler's Jefferson North Assembly Plant in Detroit, Friday, July 30, 2010. (AP Photo/Carlos Osorio)
President Barack Obama addresses employees at the Chrysler's Jefferson North Assembly Plant in Detroit, Friday, July 30, 2010. (AP Photo/Carlos Osorio)
President Barack Obama, followed by Sen. Debbie Stabenow, D-Mich., and Sen. Carl Levin, D-Mich., arrive at Detroit Wayne County Airport in Detroit, Friday, July 30, 2010. (AP Photo/Pablo Martinez Monsivais)
President Obama delivers an education reform speech at the National Urban League's 100th anniversary convention at the Washington Convention Center in Washington on Thursday, July 29, 2010. (UPI/Roger L. Wollenberg)
President Barack Obama is greeted by National Urban League President and CEO Marc Morial before delivering remarks at the National Urban League 100th Anniversary Convention in Washington, Thursday, July 29, 2010. (AP Photo/Pablo Martinez Monsivais)
President Obama delivers an education reform speech at the National Urban League's 100th anniversary convention at the Washington Convention Center in Washington on Thursday, July 29, 2010. (UPI/Roger L. Wollenberg)
President Obama delivers remarks at the National Urban League's 100th anniversary convention in Washington on Thursday, July 29, 2010. (AP Photo/Pablo Martinez Monsivais)
President Obama gestures while addressing the National Urban League's 100th anniversary convention in Washington on Thursday, July 29, 2010. (AP Photo/Pablo Martinez Monsivais)
President Obama greets the crowd after delivering an education reform speech at the National Urban League's 100th anniversary convention at the Washington Convention Center in Washington on Thursday, July 29, 2010. (UPI/Roger L. Wollenberg)