“The fact that voters ultimately treated Trump as if he were just another Republican speaks to the enormous weight party polarization now exerts on our politics—a weight so heavy that it can take an election as bizarre as 2016 and jam the result into the same grooves as Romney’s contest with Obama or Bush’s race against Kerry. We are so locked into our political identities that there is virtually no candidate, no information, no condition, that can force us to change our minds. We will justify almost anything or anyone so long as it helps our side, and the result is a politics devoid of guardrails, standards, persuasion, or accountability.”