Anthony Downs's "An Economic Theory of Democracy" is one of the handful of books that reshaped political science in the post-World War II period. "Information, Participation, and Choice" traces the influence of Downs's ideas on subsequent research on voters, candidates, and parties in the United States and elsewhere.Since their publication in 1957, Downs's seminal ideas -- tweedledum and tweedledee politics and the "rationality" of political ignorance...