Jason's new book, Letterman: The Last Giant of Late Night ... Letterman's influences: Carson, Allen, and Paar ... Letterman as a postmodern figure ... Looking at Letterman and women through the lens of #MeToo ... Letterman's self-hatred and depression ... How the show changed on CBS and the war with Leno ... Late-period Late Show, a bizarre place to work ... Jason: Letterman helped normalize Donald Trump ...