Langen was a member of the Kennedy (Minnesota) School Board and served as its president from 1948 to 1950. Langen also served on the
South Red River Town Board from 1947 to 1950. He was elected to the
Minnesota House of Representatives where he served from 1951 to 1959. He became the
Republican leader of the state house in 1957. In 1958, he ran for the
United States House of Representatives against the incumbent
DFL Party representative
Coya Knutson. Although Knutson was initially expected to win the race, her husband released a letter now known as the "
Coya, Come Home" letter publicly pleading with her to give up her career in Washington. The letter damaged her campaign and Langen won by 1,390 votes. Langen voted in favor of the
Civil Rights Acts of 1960,
1964, and
1968, as well as the
24th Amendment to the U.S. Constitution and the
Voting Rights Act of 1965. He won re-election five times serving on the
Agriculture and
Appropriations. In 1970, Langen faced off against
Robert Bergland, whom he defeated in
1968. Bergland, a farmer and former
Agriculture Department official, benefited from local agricultural concerns and defeated Langen. ==Later career==