Maxwell Sieben Baucus (né Enke; born December 11, 1941) is an American politician who served as a United States senator from Montana from 1978 to 2014. A member of the Democratic Party, he was a U.S. senator for over 35 years, making him the longest-serving U.S. senator in Montana history. President Barack Obama later appointed Baucus to replace Gary Locke as the 11th U.S. ambassador to the People's Republic of China, a position he held from 2014 until 2017.
