No, he was offered that because he was a smart, insightful man. The world is littered with smart, insightful men whom nobody pays attention to, though. Stewart's cutting humour and his ability to create a compelling story out his mockery of the absurdity of others' stupidity and hypocrisy is what got him the following so that people paid attention to his insights instead of ignoring those insights in the same way that they ignore the insights of so many others.
Having good arguments is meaningless unless you also have the tools to get people to pay attention to those arguments. Humour is one of the best ways to do that.
Yes, but it's the insights that, in the end, make him a game changer. That, and younger people not going anywhere else to get their news.
And there's a reason that they went to him for their news instead of an equally insightful person who gave a dry and boring account of the same issues on PBS. It was because he was extraordinarily funny and entertaining and made them laugh their asses off and they ended up learning something at the same time.
I mean, do you feel that Stewart had insights on issues which other people did not have? If so, what were those insights? I see him as having said the same thing that hundreds of others were also saying but because of the way he said it (ie - his humour and mockery), he got people to listen a lot more.