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CUSHING, OK - MARCH 22: Pipe is stacked at the southern site of the Keystone XL pipeline on March 22, 2012 in Cushing, Oklahoma. (Photo by Tom Pennington/Getty Images)
CUSHING, OK - MARCH 22: Pipe is stacked at the southern site of the Keystone XL pipeline on March 22, 2012 in Cushing, Oklahoma. (Photo by Tom Pennington/Getty Images)
