He served as Warren County Commissioner from 1950–1962, and was then elected to the Ohio House of Representatives in 1962, a post he maintained for 30 years until his retirement in 1992.

Much of Corwin's status stemmed from his close relationship to Ohio House Speaker Vern Riffe.

In 1988, Riffe was quoted by The Cincinnati Enquirer as saying, "I don't have any brother.

"[1] His relationship with Speaker Riffe, a Democrat, caused some consternation with the conservative wing of the Republican members of the Ohio House, however, his relationship gave him tremendous influence as a Republican.

He was inducted into the Harness Racing Museum & Hall of Fame in Goshen, New York.