President Obama speaks to workers about the economy during a Monday, Dec. 10, 2012, visit to the Daimler Detroit Diesel plant in Redford, Mich. (Associated Press)

Photo by: Charles Dharapak

President Obama speaks to workers about the economy during a Monday, Dec. 10, 2012, visit to the Daimler Detroit Diesel plant in Redford, Mich. (Associated Press)