Support WBURFor Protesters, Keystone Pipeline Is Line In Tar SandPlay04:37Download AudioRichard HarrisSeptember 01, 2011 ShareU.S. Park Police officers arrest demonstrators in front of the While House on Thursday. They were protesting against a proposed 1,700-mile-long pipeline that would carry oil from the tar sands in Alberta, Canada, to the U.S. Gulf Coast. (NPR)