As political maneuvering continues over the fate of the controversial proposed Keystone XL pipeline, one of the world's largest energy companies -- BP -- is already signaling the direction it plans to take: it's positioning itself to tap the burgeoning supply of Canadian tar sands oil. BP announced it will divest from its oil refineries on the Southern West Coast -- in Carson, Calif. -- and Texas City, Tex., and expand its operations in the Pacific Northwest and the Midwest.