The movie you are referring to is "The Candidate," which stars Robert Redford. Released in 1972, the film follows a young, idealistic politician, Bill McKay, as he unexpectedly runs for the U.S. Senate in California. While "Secret Honor," a different film featuring Philip Baker Hall, focuses on the fictionalized monologue of former President Richard Nixon reflecting on his presidency and Watergate, "The Candidate" captures the political climate leading up to the Watergate scandal.

Yes, "Secret Honor" is based on a true story. The film, directed by Robert Altman and released in 1984, is a fictional monologue by former U.S. President Richard Nixon, portrayed by Philip Baker Hall. It takes place in a single setting, where Nixon reflects on his life, presidency, and the Watergate scandal. While the specifics of the monologue are imagined, it draws from real historical events and Nixon's own experiences, providing a dramatic interpretation of his thoughts and feelings following his resignation.

"Frost/Nixon" is a dramatization of the interviews between British journalist David Frost and former U.S. President Richard Nixon, focusing on Nixon's resignation and Watergate scandal. While the film captures the essence of the interviews and the political climate, it takes creative liberties for dramatic effect. Key moments are dramatized or simplified, and character portrayals may not fully reflect historical accuracy. Nonetheless, it effectively conveys the tension and significance of the events, making it a compelling narrative rather than a strict documentary.