Democrats from the White House on down have now gone all in on an absurd effort to use Russian hacking to delegitimize the Trump presidency.

“You didn’t need a security clearance to figure out who benefited from malicious Russian cyberactivity,” said White House spokesman Josh Earnest, claiming Trump “called on Russia to hack” Hillary Clinton.

Yeah — in a joke aimed at Clinton’s national security-endangering email abuses.

Senate Minority Leader Harry Reid — the most free-ranging liar Washington’s seen in decades — flat-out charged the president-elect “was in on” Russian hacking of top Democrats’ email.

Imagine: We now have Democrats hailing the CIA’s intelligence-gathering (which they’ve ridiculed for decades) and darkly accusing Moscow of infiltrating top US political circles and threatening the very fabric of American democracy. This is exactly what liberals used to call McCarthyism.

Never mind that, in the runup to the 2014 elections, Team Obama withheld news that Russia had hacked into both State Department and White House computers — then pooh-poohed any threat after it was disclosed.

The fact is, Russia has been cyberattacking US government agencies for years. It’s been public knowledge all along — as it was when hacking aimed at US politics was first disclosed in 2015. That the White House has only now gone into hyperdrive over this “dangerous” threat is the ultimate hypocrisy.

Did Moscow meddle in US politics this year? Probably (though it’d be nice to see public proof). Even President Obama admitted it’s been doing that “since the days of the Soviet Union.” Did that meddling toss the election to Trump? Of course not. Try to find anyone who was moved by the internal chatter at the Democratic National Committee to vote against Clinton.

No, the real story here is about a party in denial about the causes of its devastating defeat — and which apparently would rather burn down the Republic than accept the truth.