Legal scholar Peter M. Shane confronts U.S. presidential entitlement and offers a more reasonable way of conceptualizing our constitutional presidency in the twenty-first century. In the eyes of modern-day presidentialists, the United States Constitution's vesting of "executive power" means today what it meant in 1787. For them, what it meant in 1787 was the creation of a largely unilateral presidency, and in their view, a unilateral presidency still...