Senate President (U.S. Vice President): Hannibal Hamlin
President Pro Tempore: William P. Frye
Party Conference Chair: Wallace H. White, Jr., George J. Mitchell.
Majority Leader: George J. Mitchell, Wallace H. White, Jr.
Minority Leader: Wallace H. White, Jr.
Republican Conference Secretaries: Frederick Hale, Wallace H. White, Jr.
Democratic Policy Committee Chair: George J. Mitchell
Democratic Senatorial Campaign Committee Chair: George J. Mitchell
Standing Committee Chairs Since 1947:
- Budget: Edmund S. Muskie
- Governmental Affairs: Susan Collins
- Homeland Security and Governmental Affairs: Susan Collins
- Interstate and Foreign Commerce: Wallace H. White, Jr.
- Small Business and Entrepreneurship: Olympia J. Snowe