“Our best days aren’t behind us; they’re before us,” President Joe Biden said last night at the Democratic National Convention. A statesman must believe that what he is doing will benefit his country after he exits the stage, but Biden’s speech was on the first, rather than the last, day of the convention because his fellow Democrats had concluded that his own best days were behind him and nudged him to step down from the nomination. And so there Biden was, capping off a night on which the Democrats pursued a delicate mission: to honor the sitting president before quickly changing gears to produce a coming-out party for Kamala Harris, their newly named presidential nominee.