FILE - In this Friday, July 20, 2012 file photo, a drilling rig is pictured near Calumet, Okla. America's decision to re-elect President Barack Obama over Republican presidential candid

 

              FILE - In this Friday, July 20, 2012 file photo, a drilling rig is pictured near Calumet, Okla. America
FILE - In this Friday, July 20, 2012 file photo, a drilling rig is pictured near Calumet, Okla. America's decision to re-elect President Barack Obama over Republican presidential candidate, former Massachusetts Gov. Mitt Romney will impact key sectors of the American economy. The boom in U.S. oil and gas production during the president's first term will likely continue, thanks largely to new drilling techniques. But drilling could slow if the Environmental Protection Agency toughens rules governing a controversial technique called hydraulic fracturing. (AP Photo/Sue Ogrocki)