The Republican National Committee should offer to be the official sponsor of a weekly Democratic presidential debate. There would be no better advertisement for President Trump’s re-election. Every time the Democratic presidential contenders gather together, it’s a contest between the merely delusional, the vaguely vindictive and the patently absurd.

There are funny moments, like when Andrew Yang risked the ire of the political-correctness police and told us, “I am Asian, so I know a lot of doctors.” There are substantive moments, like when former Vice President Joe Biden reversed himself on China, apparently now agreeing with Mr. Trump that intellectual-property theft is a serious problem. The debates would make for entertaining television, were the ideas discussed not so dangerous.

John F. Kennedy challenged and inspired the nation by exhorting: “Ask not what your country can do for you—ask what you can do for your country.” Today’s Democrats seem to believe JFK got it backward. They compete to see who can borrow and spend more money to give away more “free” government benefits. Mr. Yang brilliantly cuts out the middleman and, channeling his inner game-show host, showers cash on lucky supporters.

Jeb Bush famously remarked that he might have to “lose the primary to win the general.” Today’s Democrats have reversed that proposition—they seem intent on losing the general election to win the primary. Their radical ideas include open borders, confiscating guns, paying reparations for slavery, adding trillions of dollars in new government spending, taking away employer-based health care and restructuring the entire economy through the Green New Deal.

When it comes to health-care policy, some of the Democratic candidates are lying and some are merely confused, but all are deceiving the American people. President Obama falsely promised that Americans could keep their health care plans if they liked them. Today’s Democrats disagree on whether to kill private insurance quickly through Medicare for All or gradually through a government-run public option. They may differ on candor and strategic timing, but they all seem to want to take away consumers’ ability to choose and keep private health insurance.