Senator Hart served the State of Colorado in the United States Senate and was a member of the Committee on Armed Services during his tenure. Senator Hart was a candidate for the Democratic nomination for president in 1984. He was co-chair of the U.S. Commission on National Security in the Twenty First Century, otherwise known as the Hart-Rudman Commission, an effort which warned of the danger of attacks on the U.S. homeland. He also co-chaired the Council on Foreign Relations task force on homeland security, which released a major report entitled “America – Still Unprepared, Still in Danger.” He has been a visiting fellow and lecturer at Oxford University. He is the author of The Shield and the Cloak: The Security of the Commons (2006).