He served in the United States Army, European Theater, Field Artillery from 1943 to 1946.

He was employed in the agriculture service department of Montana Flour Mills from 1953 to 1954.

Shoup was elected alderman on the Missoula City Council from 1963 to 1967, serving as president from 1965 to 1967.

His chief concerns as a U.S. Representative were the Conquest of Cancer Act, soldiers missing in action from the Vietnam War, energy development, and proper labeling of beef products.

This article incorporates public domain material from the Biographical Directory of the United States Congress