Between 1964 and 1969, he served as a Legislative Aide to Democratic senator
Vance Hartke. His first attempts at elected office came in 1970 and 1972, when he was the Democratic candidate for
Indiana's 10th congressional district. During his years in Congress, Sharp participated in the passage of major energy legislation. As chairman of the Energy and Power Subcommittee, he played key roles in the 1990 Clean Air Act Amendments and the 1992 Energy Policy Act. He was a member of the National Research Council Committee on Effectiveness and Impact of Corporate Average Fuel Economy (CAFE) Standards, which issued its major report in 2001. He also chaired the Secretary of Energy's Electric Systems Reliability Task Force, which issued its major report in 1998. == Later years ==