President Obama and Transportation Secretary Ray LaHood (right) are met by (from left) Detroit Mayor Dave Bing, Rep. John D. Dingell, Sen. Carl Levin and Michigan Gov. Rick Snyder after stepping off Air Force One upon arriving at the Detroit Metropolitan Wayne County Airport in Romulus, Mich., on Monday, Dec. 10, 2012, before going to the Daimler Detroit Diesel plant in Redford. (AP Photo/Charles Dharapak)

Photo by: Charles Dharapak

President Obama and Transportation Secretary Ray LaHood (right) are met by (from left) Detroit Mayor Dave Bing, Rep. John D. Dingell, Sen. Carl Levin and Michigan Gov. Rick Snyder after stepping off Air Force One upon arriving at the Detroit Metropolitan Wayne County Airport in Romulus, Mich., on Monday, Dec. 10, 2012, before going to the Daimler Detroit Diesel plant in Redford. (AP Photo/Charles Dharapak)