Robin Williams Biden jokes resurface...but there are twists!

Joe Biden picks Kamala Harris to be VP opening up a new line of jokes for the Late Night hosts. Republicans dust off a Robin Williams' Biden joke from 2009 and Robin's daughter Zelda shoots back. A new doc about Robin is coming. Macgruber is back. Kal Penn hets a show. And Martin Short and Steve Martin are teaming up with....Selena Gomez?