The 59-41 vote fell just one vote short of overcoming a filibuster led by Democrats.
In addition to Landrieu, Democrats who backed the pipeline included Sens. Mark Begich of Alaska, Bob Casey of Pennsylvania, Joe Donnelly of Indiana, Kay Hagan of North Carolina, Heidi Heitkamp of North Dakota, Joe Manchin III of West Virginia, Claire McCaskill of Missouri, Mark Pryor of Arkansas, John Walsh of Montana and Mark Warner of Virginia.