In 2000 the Green Party was accused of ruining things for the Democrats. Did Ralph Nader throw the election from Al Gore to George W. Bush? The cognoscenti are still divided, but the 2020 parallels are strong. Probably most Green voters would have gone Democratic if forced into a binary choice. Similarly, on the Libertarian-O-Meter, Mr. Trump scores much higher than Mr. Biden.

Yes, the Donald is a protectionist, and free trade is the preferred policy of those who favor economic and personal liberty. But when it comes to lowering taxes and easing regulations on business, the party of the elephant is far more closely aligned to the libertarian philosophy than that of the donkey. Mr. Trump has appointed conservatives to the Supreme Court, not libertarians like Randy Barnett, Clint Bolick, Jacob Huebert, Gregory Rome or Brandon Thibodeaux. But supporters of the freedom philosophy prefer judges who adhere to the U.S. Constitution over those who make things up as they go along.

In contrast, Mr. Biden is a puppet in the marionette hands of out-and-out socialists like Bernie Sanders and Alexandria Ocasio-Cortez. Yes, there are some issues on which libertarians are closer to Democrats, such as Oregon’s decriminalization of heroin and cocaine. But these are few and far between.