I loved Altman's HBO television cross-over Tanner '88 written by Doonesbury creator Garry Trudeau. It took a fake presidential candidate on the real campaign trail with very droll results. The show had a reprise starring the same cast during the last prez election.
My favorite film was his 1992 inside Hollywood pic The Player - the pitch sessions are classic and hilarious. And Altman's irreverent take on characters running a mobile field hospital in Korea - M.A.S.H. was just so gritty, grim, and funny.