Political Action Committees.

The Emergence of the Public-Opinion Poll.

Roosevelt's Slimmest Victory.

The Urbanization of the Democratic Party.

Sources:

Arthur M. Schlesinger, Jr., The Age of Roosevelt, 3 volumes (Boston: Houghton Mifflin, 1956-1960);

Schlesinger, ed., The History of American Presidential Elections, 1789- 1968 (New York: Chelsea House, 1971);

Schlesinger, ed., History of U.S. Political Parties (New York: Chelsea House, 1973).