http://splitsider.com/2014/05/carson-letterman-and-stewart-three-early-failures-and-the-lessons-they-learned-from-them/

Here’s recalling the early struggles of “The Johnny Carson Show,” “The David Letterman Show” and “The Jon Stewart Show.”
Read more at http://www.hitfix.com/tv-tattle#CLe4HmymASOgYMvd.99