Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at Charlotte Pipe and Foundry Company in Charlotte, N.C., Friday, May 11, 2012. (AP Photo/Jae C. Hong)

Photo by: Jae C. Hong

Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at Charlotte Pipe and Foundry Company in Charlotte, N.C., Friday, May 11, 2012. (AP Photo/Jae C. Hong)