I believe Watergate shows that the system did work. Particularly the Judiciary and the Congress, and ultimately an independent prosecutor working in the Executive Branch.

The book and movie also led to one of Washington D. Woodward and Bernstein followed up with a second successful book on Watergate entitled The Final Days (Simon and Schuster 1976) covering in extensive depth the period from November 1973 until President Nixon resigned in August 1974. 1 are
The Choice—about Bill Clinton's re-election bid; (1996) ISBN 0-684-81308-4
Maestro—about Federal Reserve chairman Alan Greenspan; (2000) ISBN 0-7432-0412-3
The Secret Man—about Mark Felt's disclosure after more than 30 years that he was Deep Throat.

While a young reporter for The Washington Post in 1972 Woodward was teamed up with Carl Bernstein; the two did much of the original news reporting on the Watergate scandal. Robert Upshur “Bob” Woodward (born March 26 1943) is an American investigative journalist and non-fiction author.