Thomas Sowell: Obama is the Most Unconstrained Politicianbr The Hoover Institution - Hoover Institutionbr Sowell describes the critical differences between interests and visions. Interests, he says, are articulated by people who know what their interests are and what they want to do about them. Visions, however, are the implicit assumptions by which people operate.In politics, visions are either "constrained" or "unconstrained.