Following Friday night's airing, 15 years after the fact, of Bill Hicks' 12th appearance on The Late Show With David Letterman, which was originally censored by the host himself that October 1993 night, a touching remembrance of the late, great, politically charged comedian comes from an unlikely source: a Richard Nixon apologist.OK, to be fair, Frank Gannon is much more than a Nixon apologist. He is a frequent contributor to the New Yorker's "Shouts and Murmurs" and the New York Times Magazine'