The U.S. Constitution is a blueprint for the design of a government which reflects the consistent application of an understanding of the emotions and interests driving the political activity of individuals and groups. This understanding is articulated in the writings of key proponents of the Constitution, and clarified by its historical and philosophical context. Their theories are congruent with psychoanalytic perspectives on narcissism, leadership, group dynamics, and the role of transitional space in cultural life. The concept of interests, reformulated in psychoanalytic terms, is a useful addition to our understanding of political behavior.