Associated Press: The U.S. energy boom is blurring the traditional political battle lines across the country. Democrats are split between environmentalists and business and labor groups, with the proposed Canada-to-Texas oil pipeline a major wedge. Some deeply conservative areas are allying with conservationists against fracking, the drilling technique that's largely responsible for the boom. The divide is most visible among Democrats in the nation's capital, where 11 Democratic senators wrote President Barack...