US President Barack Obama tours the Daimler Detroit Diesel Plant alongside Plant Manager and Vice President of Operations Jeff Allen (L) and United Auto Workers NW Local 163 Detroit Diesel Engine Unit Shop Chairperson Mark Gibson (R) in Redford, Michigan, December 10, 2012, prior to speaking on the economy and fiscal cliff negotiations. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)