"AL FRANKEN, GIANT OF THE SENATE is a book about an unlikely campaign that had an even more improbable ending: the closest outcome in history and an unprecedented eight-month recount saga, which is pretty funny in retrospect. It's a book about what happens when the nation's foremost progressive satirist gets a chance to serve in the United States Senate and, defying the low expectations of the pundit class, actually turns out to be good at it. It's...