| by By NICHOLAS RICCARDI
DENVER (AP) — 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 Obama this month urging him to approve the Keystone XL pipeline, which is opposed by many environmental groups and billionaire activist Tom Steyer. The State Department said Friday that it was extending indefinitely the amount of time that federal agencies have to review the project, likely delaying a pipeline decision until after the November elections. MORE