for 16 years, jon stewart has made his daily show audience laugh. but he's also made them think. >> they felt he was not watering down the news. he was giving it in a language that everyone understood, intergenerational. young people could understand it but old people didn't have to ask their kids, what did he mean by that? >> the popularity grows an "the daily show" is a newsmaker itself. >> he had a great advantage. everyone wanted to be on his show. because he could have that power, he asked people anything and he usually did. >> when guests came on almost everything they did made some news and it powered a million blogs the next morning. >> all of the candidates want to be often even though they're afraid every time.