 He was elected as a Republican to the 82nd, 83rd, 84th, 85th, 86th, 87th and 88th United States Congresses, holding office from January 3, 1951, to January 3, 1965.He did not run for re-election in 1964.Ostertag voted in favor of the Civil Rights Acts of 1957, 1960, and 1964, as well as the 24th Amendment to the U.S. Constitution.