FILE - In this May 29, 2012, file photo Republican presidential candidate, former Massachusetts Gov. Mitt Romney, poses with coal miners and their families for a photo after a campaign

 

              FILE - In this May 29, 2012, file photo Republican presidential candidate, former Massachusetts Gov. Mitt Romney, poses with coal miners and their families for a  photo after a campaign
FILE - In this May 29, 2012, file photo Republican presidential candidate, former Massachusetts Gov. Mitt Romney, poses with coal miners and their families for a photo after a campaign event in Craig, Colo. Romney has criticized President Barack Obama’s treatment of coal power plants and opposes treating carbon dioxide as a pollutant and the capping of carbon dioxide emissions, but favors spending money on clean technology. He says some actions to curb emissions could hurt an already struggling economy. (AP Photo/Mary Altaffer, File)