Historians have pointed to John F. Kennedy's 1960 campaign as the first time a presidential candidate relied extensively on public opinion polls. Since then, polling has come to define American politics, and is perhaps most clearly embodied in Bill Clinton, the most poll-driven president in history. Melvin G. Holli, however, reveals that reliance on public opinion polls dates to the New Deal Era, when Franklin D. Roosevelt employed a first-generation Finnish-American named Emil Hurja to conduct polls for his 1932 and 1936 campaigns. Roosevelt's triumph in 1932 and in 1936, as well as the spectacular 1934 Democratic congressional victory, is legendary. What few people know is the story about what happened behind the scenes: Emil Hurja was the driving force behind the Democrats during the New Deal Era. Holli restores Hurja to his rightful place American history and politics, showing us that the Washington press corps were right on target when they dubbed Hurja the "Wizard of Washington."