Maurice Robert "Mike" Gravel (May 13, 1930 – June 26, 2021) was an American Democratic politician. He was member of the Libertarian Party from 2008 to 2010 when he re-joined the Democratic Party. He served as a United States Senator from Alaska (1969-1981) and, previously, as member of the Alaska House of Representatives (1953-1966, speaker from 1965-1966). Gravel was a two-time presidential candidate in 2008 and in 2020.