With the transformation of Al Franken from comedian to activist, Nick Doob and Chris Hegedus stumbled onto a good subject, but in the documentary Al Franken: God Spoke, they stumble around in it. Franken is a brilliant original—a kvetchy prankster who can suddenly marshal enough actual facts to leave his opponents sputtering impotently, like stooges in a Marx Brothers movie. (The film is worth seeing for footage of Bill O’Reilly seeking sympathy from Ann Coulter, who makes maternal noises with a mischievous glint in her eye.) The directors spend too much time with Franken at the radio mike, and they never find the most interesting part of the story: how a guiding creative force of the fundamentally apolitical Saturday Night Live was finally moved to commit to something. They get everything but the epiphany.