A number of Mailer's nonfiction works, such as "The Armies of the Night" and "The Presidential Papers", are political. He covered the Republican and Democratic National Conventions in 1960, 1964, 1968, 1972, 1992, and 1996, although his account of the 1996 Democratic convention has never been published. In the early 1960s he was fixated on the figure of President John F. Kennedy, whom he regarded as an "existential hero". In the late 1950s and throughout the 1960s and 1970s, his work mingled autobiography, social commentary, history, fiction, and poetry in a formally original way that influenced the development of New Journalism.