Question: What  attorney and an American politician of the Democratic Party in Montana was was challenged in the Democratic primary by Leif Erickson in an  election in Montana ?
Sentence (from "Burton K. Wheeler"): Burton Kendall Wheeler (February 27, 1882January 6, 1975) was an attorney and an American politician of the Democratic Party in Montana; he served as a United States Senator from 1923 until 1947.
Relevant evidence: Yes