Letterman Accidentally Jokes about Obama | The Ominous Harbinger. On the February 27th episode of Late Night with David Letterman, David Letterman 'accidentaly' joked about President Obama. Appearently, one of his writers slipped the joke into his stack of index cards before the show.
https://www.ominousharbinger.com/entertainment/letterman-accidentally-jokes-about-obama/