The district included the affluent areas of Indian Hills and Prospect.
He was defeated in the 1988 primary election for re-nomination to the state House by his fellow Republican, Susan Stokes.
Guenthner was the Republican nominee in the 1978 United States Senate election in Kentucky; he lost to the incumbent Democrat Walter Huddleston.
Six years later, Mitch McConnell, also of Jefferson County, upset Huddleston, who then became a Washington, D.C.–based lobbyist.
[2] Guenthner also made an unsuccessful run for Jefferson County judge-executive in 1985.