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 â    constrainedâ     or â    unconstrained.â     A closer look at the statements of both McCain and Obama reveals which â    visionâ     motivates their policy positions, particularly as they pertain to the war, the law, and economics.