Democrats have come a long way from “Believe all women.”

Or have they?

In a September 2018 hearing throwdown that would prove among the most memorable in American history, Sen. Sheldon Whitehouse (D-RI) grilled soon-to-be Supreme Court Justice Brett Kavanaugh about his high school yearbook.

Of particular interest to Whitehouse: teenage references to flatulence, drinking games, and a friend’s enunciation of his f-bombs.

The undignified interrogation was part of the whole-of-party effort to smear Kavanaugh as a rapist — and then a gang rapist — based on the word of Christine Blasey Ford and the preposterous, long-since-forgotten accounts of other unreliable accusers.

At the time, Whitehouse and the rest of his colleagues treated Ford’s word as gospel.

Never mind that the only friend she said would be able to provide contemporaneous corroboration of her accusation could not.

Or that said friend later revealed she was pressured into professing to believe Ford’s story.

Or that she ultimately landed on Team Kavanaugh.

Fast forward to last month, though, and Whitehouse was dismissing Lyndsey Fifield’s allegations of physical abuse against erstwhile Senate hopeful Graham Platner as “a lot of nothing” from “a woman who works for right-wing political operations.”

“Not impressed” was the phrasing he landed on to describe his reaction to them, even though Fifield furnished far more evidence for her claims than Ford ever mustered.

It was a charming sentiment out of any mouth, but it was especially enchanting emerging from that of a septuagenarian nepo baby blowhard.

Whitehouse had to withdraw his endorsement of Platner this month after another woman accused him of rape.

And when CNN’s Jake Tapper confronted the lawmaker over his treatment of Fifield on Tuesday, the beach-club bum stood by his comments.

It’s “important,” explained Whitehouse, “to evaluate whether there is corroboration, and with respect to the first allegation, there was none.”

True of the Ford’s allegation against Kavanaugh, but not of that which Fifield leveled against Platner.

He went on to suggest Fifield had “motive to mislead or fabricate” because she was part of a “Koch brothers-funded political operation.”

His disgraceful double down was a far cry from the “guilty until proven innocent” standard he had helped popularize.

This small man from the smallest state in the union isn’t the only hypocrite in his caucus.

Minority Leader Chuck Schumer (D-NY) called Ford “extremely credible,” and declared that Kavanaugh enjoyed “no presumption of innocence” back in 2018.

Still, he extended that presumption to Platner during a June press conference in which he ignored five straight questions about Fifield by repeating some variation of the canned line: “I endorsed Graham Platner. We’re going to beat Susan Collins and take back the Senate.”

If Schumer was storing milk like wine on a rack in his basement, it would have aged better.

Speaking of ungraceful aging, Senator Elizabeth Warren (D-Mass.) doubtless wishes she could take back her declaration that Platner was her “kind of man.”

And her post-Fifield accusation plea that he be judged — euphemism alert — “not for the worst things he did in the darkest part of his life.”

Warren’s weak-tea excuses rang all the more hollow in light of her comportment during the Kavanaugh affair.

“I believe Dr. Ford,” said Warren at the time.

A year later, she was still wasting her breath calling for Kavanaugh’s impeachment.

Yet this summer, she held her hands over her ears as Fifield spoke much more convincingly about Platner’s misdeeds.

It would be welcome news if Democrats have really repented of the unjust Kavanaugh standard they once championed.

If any heinous accusation — regardless of whether there’s any evidence at all to support it — was to immediately be treated as cause enough to force public figures to step aside, it would mean the end of American politics, perhaps American life, as we know it.

The line had to be held against the left’s assault on the principles of due process and following the facts where they lead.

On some level, it’s heartening to discover that they aren’t true believers in summary social and professional executions.

Or at least it would be if it hadn’t been accompanied by the revelation that they’re ruthless cynics willing to do anything and everything for power.

That’s why they’ll amplify destructive smears against an accused innocent in one breath and in the next manufacture more against a — in the true rather than the politically convenient sense of the adjective — credible accuser.

What’s actually heartening, though, is that in both instances their cynicism backfired.

Kavanaugh is an associate justice on the United States Supreme Court.

Platner is a make-believe oyster farmer who relies on his mommy’s charity for business.

When you stand for nothing but your own interests, people notice.

And all these years later, the crucible Democrats put Brett Kavanaugh through continues to burn them by reminding Americans of their ugly, self-serving priorities.