Discusses the legal, political, and financial framework in which the presidential election occurs. This edition emphasizes the changes that have revolutionized electoral politics in recent years: the flood of money to candidates and the groups that support them and its impact on election outcomes; the communications revolution and the opportunities and challenges it presents for the candidates, their advisers, and the voters; and fake news and foreign inteference in the election. This edition will also discuss the evolving norms of candidate behavior on and off the campaign trail.