President Obama speaks during a visit to the Daimler Trucks North America Mount Holly Truck Manufacturing Plant in Mount Holly, N.C., Wednesday, March 7, 2012. (AP Photo/Gerry Broome)

Photo by: Gerry Broome

President Obama speaks during a visit to the Daimler Trucks North America Mount Holly Truck Manufacturing Plant in Mount Holly, N.C., Wednesday, March 7, 2012. (AP Photo/Gerry Broome)