So what’s Garrison Keillor really like? Don’t ask Dave Barry: “I do know that he’s a generous host, and very smart, and he can be funny as hell even when he’s not on the radio. But he’s not an easy guy to get close to.” But Barry says that Keillor is one of the great comic geniuses of the age, and that his ‘Humor Processor’ is always running. Keillor has had his critics in recent days, but how many comics can produce two full hours of original material a week, every week for almost three decades, and perform it live without a hint of the arduousness of the process?