I don’t think there’s any reason to be ashamed. Richard Nixon came from practically nothing, overcame tremendous obstacles, and achieved a tremendous amount of success. He was undoubtedly one of the most important and influential figures of the 20th Century.
Nixon was a brilliant man and could have been a great President, but his paranoia and his personal flaws led to his destruction. That’s not an indictment of where he came from; it’s a judgment on what he became.