Question: What is the name of this American politician, member of the Minnesta Democratic-Farmer-Labor Party, the U.S. Representative for Minnesota's 7 congressional district, and the most senior representative from Minnesota, representing Dewey Township, Roseau County, Minnesota?  
Sentence (from "Collin Peterson"): A conservative Democrat, his district, Minnesota's largest and most rural district, includes most of the western area of the state, including Moorhead, Fergus Falls, Bemidji, Detroit Lakes, Thief River Falls, Willmar, Marshall, and Alexandria.
Relevant evidence: No