Bernie Sanders’s victory in New Hampshire on top of his tie in Iowa makes him a favorite for the Democratic presidential nomination. Hard to believe, but in a winnable race against President Trump the opposition may nominate a socialist who wants the government to control energy production and health care, who wants nationwide rent control, and who calls America a “racist society from top to bottom.” No wonder Democrats like James Carville are in agony.

The Democrats have turned religious. Not in the sense that they espouse a belief in an omnipotent and benevolent Creator or eternal and universal moral principles. They are religious in the sense that they hold dogmatic beliefs that are impervious to contradiction by logic, evidence or experience, and cultivate a moral superiority toward unbelievers. The party that loudly prides itself on tolerance and diversity is increasingly intolerant in at least three areas.

Donald Trump visited Congress this week to declare the state of the union “stronger than ever before.” Speaker Nancy Pelosi concluded the evening by highlighting the state of the Democratic Party: Intensely—perhaps fatally—divided.

That’s the prism through which to view this week’s headlines: The Iowa debacle, Democrats’ State of the Union theatrics, the president’s impeachment acquittal. Division has coursed through Democratic politics for at least the past four years. The media tries hard to present this split as nothing more than the usual intraparty tension. It’s significantly deeper than that, and Democratic hopes for the 2020 election hinge on it.

The Iowa derailment didn’t begin Monday afternoon or even in the months leading up to the failure of the results-reporting app. This train went off the tracks right after the 2016 Democratic primary contest, as a bitter progressive wing of the party stewed over Bernie Sanders’s defeat. They accused the Democratic establishment of rigging the process for Hillary Clinton—starting with Iowa, where the results were close, and where Mr. Sanders’s supporters outright challenged the legitimacy of Mrs. Clinton’s victory.

Hoping for peace, and in the name of “transparency,” party officials adopted the wildly complicated system on display Monday. The delayed results continue to be riddled with errors, making the outcome even less credible than in 2016. Sanders allies are already crying foul. They’re also pointing to new Democratic National Committee rules for debates, and nominations for convention spots, as evidence that one side of the party is again trying to deny the other side a victory.

That there are two, extremely polarized sides is also the one clear takeaway from the Iowa muddle. While the Sanders and Pete Buttigieg campaigns argue over how many state-delegate equivalents can dance on the head of a pin, the bigger point is that they ended the final vote with near equal numbers. Overall, the two candidates unapologetically pushing Medicare for All (Bernie and Elizabeth Warren) took 47% of the final vote, while the three more “moderate” contenders (Mr. Buttigieg, Joe Biden and Amy Klobuchar) took 51%.

The chasm in the party has been on display particularly under Speaker Pelosi’s leadership. It brewed in the bitter spring fights over which wing got its way on how to sanction Rep. Ilhan Omar for anti-Semitic comments; which wing spoke for the party on climate and health care; which wing set its antigun agenda. And most consequentially, which wing won the day on impeachment. Mrs. Pelosi ultimately gave in to threats against her speakership and allowed her firebrands to serve as the face of the party in a weak and doomed impeachment proceeding.

Utah Sen. Mitt Romney is basking in positive headlines after voting to convict, but the more immediately consequential votes remain those cast by Democratic moderates—who were sacrificed to the passions of Mrs. Pelosi’s liberal wing. Thirty-one House Democrats are on the ballot this year in districts won in 2016 by Mr. Trump—who has climbed to a personal-high 49% Gallup approval rating. Sen. Doug Jones (D., Ala.) voted to convict a president who won his state by 28 points last time around. Sen. Gary Peters (D., Mich.) is facing uneven polling numbers. Sen. Joe Manchin (D., W.Va.) is spared an election this year but hasn’t helped his future election prospects.

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