Jon Tester
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Jon Tester (born August 21, 1956) is an American politician serving as the senior United States Senator from Montana, a seat he was first elected to in 2006. He is a member of the Democratic Party.

Tester was first elected to the Senate in 2006, defeating Republican incumbent Conrad Burns in one of the closest Senate races of that year. He narrowly won reelection in 2012 against U.S. Representative Denny Rehberg, and in 2018 against Montana State Auditor Matt Rosendale. Tester was previously the president of the Montana Senate and worked as a music teacher and farmer. He became Montana's senior senator in 2014 following Max Baucus's departure.

Tester was born in Havre, Montana, one of three sons of Helen Marie (née Pearson) and David O. Tester. His father was of English descent and his mother was of Swedish ancestry. Tester grew up in Chouteau County, near the town of Big Sandy, Montana, on land that his grandfather homesteaded in 1912. At the age of 9, he lost the middle three fingers of his left hand in a meat-grinder accident. In 1978, he graduated from the University of Providence, then the College of Great Falls, with a B.A. in music.