President Joe Biden “totally f–ked” Vice President Kamala Harris’ 2024 bid for the White House by refusing to drop out of the race earlier, a campaign aide said.

David Plouffe, who was a key adviser for the Harris campaign, blamed the then-veep’s election loss squarely on the then-commander-in-chief, according to a new book that CNN’s Jake Tapper co-authored.

Plouffe — a senior adviser in President Barack Obama’s White House — was quoted ripping Harris’ 107-day campaign against former President Donald Trump as a “f–king nightmare,” according to an excerpt obtained by the Guardian.

A key adviser in the Obama White House made the blunt accusations against Biden in a new book.Getty Images
“And it’s all Biden,” he told the authors. “He totally f–ked us.”

Plouffe said he flagged concerns about Biden’s mental and physical ability after receiving a flurry of calls from worried donors in the wake of the incumbent’s catastrophic debate performance against Trump.

But he said he was repeatedly told the prez could still win another election.

Despite his recent claims, Plouffe was among the advisers that some Democratic insiders pointed the finger at for Harris’ election loss.

Plouffe, as well as another Obama campaign alum, Stephanie Cutter, were ripped for misjudging what issues really mattered to voters in the wake of the election.

The duo “tried an Obama play with a non-Obama candidate,” one source close to the Harris campaign said at the time. “They are the worst.”

Separately, the White House, at the time, was also publicly insisting Biden was in good health.

Despite clinging on for three more weeks, Biden ended up dropping out of the race — a move that other aides too agreed upended Harris’ chances.

“I love Joe Biden. When it comes to decency, there are few in politics like him. Still, it was a disservice to the country and to the party for his family and advisers to allow him to run again,” one senior aide was quoted as saying in the book.

He “totally f–ked us,” Plouffe said.Getty Images
“It was an abomination. He stole an election from the Democratic Party; he stole it from the American people,” a prominent Democratic strategist added.

Biden, his family, aides and the liberal media have been ripped for dismissing mounting concerns about the ailing commander-in-chief ahead of the election amid a spate of physical stumbles, verbal gaffes and moments of confusion.

A Biden spokesperson, meanwhile, dismissed the book’s claims of an apparent cover-up, saying, “Yes, there were physical changes as he got older, but evidence of aging is not evidence of mental incapacity.”

President Joe Biden and Vice President and Democratic presidential candidate Kamala Harris arrive to speak at Prince George’s Community College in Largo, Maryland, on August 15, 2024.AFP via Getty Images
“And so far, we are still waiting for someone, anyone, to point out where Joe Biden had to make a presidential decision or make a presidential address where he was unable to do his job because of mental decline. In fact, the evidence points to the opposite — he was a very effective president.”

Mounting pressure over Biden’s mental decline, as well as dismal polling, ultimately led Biden to withdraw from the 2024 race and endorse Harris.