President Barack Obama watches workers during a visit to the heavy duty engines line at the Daimler Detroit Diesel plant in Redford, Mich., Monday, Dec. 10, 2012. (AP Photo/Charles Dharapak)

Associated Press
President Barack Obama watches workers during a visit to the heavy duty engines line at the Daimler Detroit Diesel plant in Redford, Mich., Monday, Dec. 10, 2012. (AP Photo/Charles Dharapak)
President Barack Obama watches workers during a visit to the heavy duty engines line at the Daimler Detroit Diesel plant in Redford, Mich., Monday, Dec. 10, 2012. (AP Photo/Charles Dharapak)
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