The presidential election of 1920 was one of the most dramatic ever. For the only time in the nation's history, six once-and-future presidents hoped to end up in the White House: Woodrow Wilson, Warren G. Harding, Calvin Coolidge, Franklin Delano Roosevelt, Herbert Hoover, and Theodore Roosevelt. It was an election that saw unprecedented levels of publicity -- the Republicans outspent the Democrats by 4 to 1 -- and it was the first to garner extensive...