Cross-posted on my blog. The noted political scientist Aaron Wildavsky (now deceased) wrote in 1966 that the U.S. "has one President but two presidencies: one for domestic affairs and the other is concerned with defense and foreign policy." He continued, "Since World War II, presidents have had much greater success in controlling the nation's defense and foreign policies than in dominating its domestic policies."While some challenge Wildavsky's argument, there is a lot of truth in it. This is because Presidents have tremendous power to dominate the national agenda, relatively immune from...