"Biden shouldn’t wait until December — when we might be out in the streets wondering how the hell Trump won by 78,000 votes again — or even until the Democratic convention in Milwaukee in early July, when the party needs to be more unified than it is now, to reveal some of the key players in his administration. The emphasis ought to be not just on competence — reminding voters that the grown-ups will be in charge after four years of Trump — but also to show young people that even if Biden isn’t a card-carrying leftist, his presidency would still be the most progressive one in modern U.S. history."