Yes, he was on and a writter for SNL. He was with Davis as the "Franken and Davis Show"
My favorite writter for SNL was Michel O'Donoghue, and he has a very FReeperesque opinion of Franken. O'Donoghue was one of the geniuses behind National Lampoon Magazine, and was hired as a senior headwritter for SNL, and he also played "Mr Mike", the small bald guy with round sunglasses with very dark stories, if any of you remember that.
He hated Franken. Davis said "He thought Al was an obnoxious, egomaniacal a**hole," and made Franken the target of many putdowns. Whenever Franken submitted an idea or sketch, O'DOnoghue would label it "SHIT", or dismiss it all together.
In one writters meeting, Franken and Davis pushed for a sketch they thought was funny, but O'donoghue and Sargent (another senior writter) disagreed. When Franken openly disputed O'Donoghue's opinion,he, the senior writter, walked over to Franken, grabbed the script from his hand, took it to the window and let it drop 17 floors to the pavement. End of discussion. This angered Franken, but delighted Davis: "Franken was always trying to bully me, too, and it was great to see him get kicked in the nuts" he said.
(I just put this on another thread, thought is was good for this one also).