Al Franken's guide to making money: 1) Find a successful high-profile right-wing person in the media who really annoys the hell out of liberals. 2) Write book demonizing said person. 3) Watch as liberals line up to buy copies of the book so they can feel better about themselves. 4) Count the money.
He's the epitome of a successful capitalist pig--find a niche market and make a mint. Of course I doubt he'd be pleased to be described that way.
Which just goes to show that Franken is such an idiot, that even he would screw-up a simple formula for success. All things being equal, more people spend more money and buy more boooks skewering the Left than the Right.