Mary Kathryn “Heidi” Heitkamp (; born October 30, 1955) is an American businesswoman, lawyer and politician who served as a United States senator from North Dakota from 2013 to 2019. A member of the North Dakota Democratic-Nonpartisan League Party, she was the first woman elected to the U.S. Senate from North Dakota. She served as the 28th North Dakota Attorney General from 1992 to 2000 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 was North Dakota’s second female senator, after Jocelyn Burdick, and the first woman to be elected to the Senate from that state.On November 6, 2018, Heitkamp was defeated in her bid for reelection by Republican congressman Kevin Cramer.Following her election defeat, Heitkamp became a CNBC contributor and a visiting fellow at the Institute of Politics at Harvard Kennedy School. In April 2019, with Senator Joe Donnelly of Indiana (who also lost reelection in 2018), she launched One Country Project, an organization aimed at helping Democrats reconnect with rural voters.