The Richard Nixon Presidential Library and Museum in Yorba Linda, California, recently opened a new exhibit about Watergate.   Library Director Timothy Naftali gave American History TV a tour of the exhibit, which chronicles events beginning in 1971 that led up to the break-in at the Watergate offices of the Democratic National Committee on June 17, 1972. Mr. Naftali also discussed the aftermath of the scandal, the resignation of President Nixon on August 9, 1974, and the lasting impact that Watergate made on our system of government. Extensive samples of Watergate evidence, including documents, oral histories, audio recordings and vintage television clips are available to explore online at nixonlibrary.gov