Voorhis's appearance was overshadowed by the controversial participation of Nixon adversary Alger Hiss.[75] In 1972, Voorhis authored a book, The Strange Case of Richard Milhous Nixon, in which he stated that Nixon was "quite a ruthless opponent" whose "one cardinal and unbreakable rule of conduct" was "to win, whatever it takes to do it".[76] In 1981, three years before his death, Voorhis denied in an interview that he had been endorsed by the NCPAC.[77]