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Produced by Robert Drew, shot by Richard Leacock and Albert Maysles, and edited by D. A. Pennebaker,  charted new territory in documentary film making. Using lighter, more mobile cameras and sound equipment, the filmmakers achieved greater intimacy with their subjects, following on their heels as the candidates wound through packed crowds and hovering like gnats to capture their more private moments. Modern political and news reporting owes much to the audacity of this film's invasive technique.

 was added to the National Film Registry in 1990.