Sen. Chuck Schumer didn’t learn one of the primary lessons of the 2024 election: Americans resent getting fed insultingly obvious lies.

Interviewing Schumer on Sunday, NBC News’ Kristen Welker played a clip of him in February claiming President Biden’s “mental acuity is great” and calling any suggestion otherwise “right-wing propaganda.”

She prodded Schumer to explain himself: “What do you say to Americans who feel as though you and other Democrats misled them about President Biden’s mental acuity?”

Someone with an ounce of shame (or sense) might take the opportunity to grovel or at least apologize, but Schumer opted for a fresh whopper: “We didn’t. Let’s look at President Biden. He’s had an amazing record … He’s a great guy, and when he stepped down, he did it on his own because he thought it was better, not only for the Democratic Party, for America.”

Did it on his own … with Nancy Pelosi’s knife to his neck and the party’s donors on strike.

And still no acknowledgment that Biden had been clearly, painfully, publicly failing for months even as Schumer & Co. insisted he could do four more years (as an animatronic figure, maybe).

Sunday, Chuck dodged “I’m not going to speculate” on whether Biden could’ve served a second term, when months earlier he was part of the chorus insisting Joe was “sharp,” “detail-oriented” and “on his game” and denouncing the “right-wing propaganda” to the contrary.

Even though White House aides have admitted to the Wall Street Journal that they started hiding Joe’s mental decline on Day 1 of his presidency.

Even before the disastrous debate, the truth was obvious to anyone watching the prez at any public event.

Yes, Chuck in private reportedly told Joe to drop out of the race in July. But he’s still in public denial.

It’s one thing for Schumer to drone on now about all the wonderful things the prez achieved, another entirely to pretend he wasn’t part of the obscene cover-up.

He met face to face with Biden throughout, as he had with past presidents. One way or another, he had to realize the truth — but chose to play along with the lies.

Schumer’s not scrambling to salvage Biden’s legacy, but his own image.

By trying to repeddle a fantasy that fell apart months ago, Chuck’s only proving that he and his party still can’t be trusted.