Stephen Colbert has a thoughtful answer to the question of who he believes is smarter: him or Jon Stewart?
“I have a better memory than Jon Stewart,” Colbert replied, answering a fan question about himself online as part of GQ’s “Actually Me” series. “I have quick recall. If I read it and I like it, I probably know it. And people mistake that for intelligence, because then you can make associations between things that you remember. And you go, ‘Wow, he really synthesized that quickly.’” He explained, “That’s not the same thing as thinking.”
“Jon Stewart’s a much clearer thinker than I am. That’s why he can reframe arguments on TV, and in very quick and very interesting ways. Because he’s doing an analysis of what’s actually happening here.”
Elsewhere in the interview, Colbert was also

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