This study incorporates three important themes into the study of presidential selection: What are the international implications of how the Unites States chooses its presidents? How does the process affect other nations? Does it enhance or diminish the ability of the United States to deal effectively with the rest of the world? How do the changing characteristics of the the presidential selection process affect the shaping of public policies, and vice versa? For example, how have changes in citizen participation, campaign technologies, and campaign finance laws altered the balance of political power among institutions and interests? What is the influence of the Constitution on presidential selection, as in the prescribed qualifications for the office and in provisions for unusual circumstances?