You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Watch Jon Stewart Celebrate Stephen Colbert's 'Late Show' Hire And Then Watch Colbert Pay Tribute to David Letterman By Simon Dumenco, Published on April 11, 2014 0 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Become a Member Already a member? Log in.