Joe Biden’s re-election team is playing it cool. The Biden campaign has long been shrugging at the president’s fading polls, turning down opportunities to put him in front of voters, and generally doing their best to portray an air of confident nonchalance. The campaign’s apparent lack of concern seems, or perhaps is meant to seem, like an expression of certainty in the outcome: that Biden will win re-election, and that it won’t be close. They want us to think that they’ve got it in the bag. They do not. Biden is in no way guaranteed re-election, and all available information...