One of my Facebook friends indicated that Stewart was being disingenuous for not owning his power as socio-political commentator. I agree wholeheartedly.
His repeating that "he's just a comedian" gives him the illusion of absolving himself of responsibility for influencing the sad state of the national political media for the better. Avoiding accountability means he can keep laughing and pointing at the mess, but not do anything to clean it up.
Unfortunately for Stewart, he's outgrown those pants.
Update: From Mediaite ...
Stewart goes on to explain, quite adroitly, his role as satirist relative to that of an opinion media personality, but it’s not exactly correct to claim that he adds his commentary from the sidelines. Mr. Stewart is very much in the game of forming opinions based on the news, though to be fair, his take is significantly different from that of Maddow and others. But 200,000 participants at the Rally to Restore Sanity didn’t “meta-participate” in a support for a reasoned and sane discourse. Stewart is in the game, though he’s clearly much more comfortable (and perhaps even effective) voicing his critique from the sidelines. Whether he asked for it or not, Stewart has been handed the Cronkite “most trusted” mantle. That puts him, not in the game, and not in the stands, but in the zebra shirt, refereeing the whole affair.