President Obama Walks At TransCanada Stillwater Pipe Yard

President Barack Obama walks with White House Advance Associate Valerie Tyburski following an event at the TransCanada Stillwater Pipe Yard near Cushing, Okla., March 22, 2012. Walking behind the President are Trip Director Marvin Nicholson and Vic Erevia, U.S. Secret Service Special-Agent-in-Charge. (Official White House Photo by Pete Souza)

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• March 2012: Photo of the Day