U.S. Senator Lindsey Graham (R-SC) arrives for a vote on whether to overturn a presidential veto of the Keystone XL pipeline, at the U.S. Capitol in Washington, March 4, 2015. The U.S. Senate failed on Wednesday to overturn Obama's veto of legislation approving the Keystone XL oil pipeline, leaving the contentious project to await an administration decision on whether to allow it. REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS ENERGY ENVIRONMENT)