Mary Kathryn "Heidi" Heitkamp (; born October 30, 1955) is an American businesswoman, lawyer, and politician serving as the junior United States Senator from North Dakota since 2013. A member of the North Dakota Democratic-Nonpartisan League Party, she is the first woman elected to the U.S. Senate from North Dakota. She served as the 28th North Dakota Attorney General from 1993 to 2001 and as State Tax Commissioner from 1986 to 1992.
Heitkamp ran for governor of North Dakota in 2000 and lost to Republican John Hoeven. She considered a bid for the Democratic nomination in the 2010 U.S. Senate election to replace retiring Senator Byron Dorgan, but on March 3, 2010, she declined to run against Hoeven, who was ultimately elected.In November 2011, Heitkamp declared her candidacy to replace Kent Conrad as U.S. Senator from North Dakota in the 2012 election. She narrowly defeated Republican Congressman Rick Berg on November 6, 2012, in that year's closest Senate race. Heitkamp is North Dakota's second female Senator, after Jocelyn Burdick, and was the first woman to be elected to the Senate from that state. Wikipedia