I mean, Al Franken has always been funny, but 90% of his humor has to do with how he looks while doing his routine...you have to admit--he IS funny looking! Consider for a moment the difference between SEEING Jay Leno's monologue vs. reading it in the next-day transcript.
On radio, all that's left is Franken's biting sarcasm. I'm not convinced that will travel well over the unseen airwaves.
I don't believe it'll come across as biting sarcasm on the radio, just childish whining.