The star of The Carol Burnett Show, the beloved CBS variety series that ran for a dozen successful seasons back in the Sixties and Seventies, is honored as the recipient of this year’s Mark Twain Prize. She’s a very deserving recipient, and is toasted by an appropriate bevy of adoring celebrity peers and acolytes (Julie Andrews, Tony Bennett, Tiny Fey, Amy Poehler) – but when is this organization going to recognize, and give the Mark Twain Prize, to another CBS variety act that