The Novel on American Politics
"The Last Hurrah" by Edwin O'Connor. Unmatched. Easily the best novel on American politics. It's also very funny.
The movies based on the book, including the one with Spencer Tracy, are vastly inferior to the novel. [Tracy was well-cast as the lead and did a fine job but many of the novel's best scenes were dropped.]
If the movie were to be filmed today, Jack Nicholson should be cast as Frank Skeffington.