Romenesko

Harvard Political Review
Maureen Dowd says: "I went on the Colbert show for my first book, and it spoiled me because you’re talking about all this kind of politics stuff and either the audience is really savvy from watching him every night, or they just love him and laugh a lot. Then I went on Letterman and made a joke about Paul Krugman and Letterman and the audience were just dead silent. And at the break, I said to Letterman I promise if you ever invite me back I'll never make another Paul Krugman joke."