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Mort Sahl was a comedian in the 1950s-80s who satirized presidents and presidential candidates. He revolutionized comedy because his comedy routines jumped around sporadically even when he was telling a story. During the 1960 presidential election he said "Vote No for President - let's keep the White House empty for another four years" as an attack on President Eisenhower and his perceived ineffectiveness.
Sources: Quint, P. E. (1960, October 21). Mort Sahl. The Harvard Crimson.