WASHINGTON — Former first lady Jill Biden’s 2024 election revision tour kicked into full swing on Sunday when she insisted she fully supported Kamala Harris’ White House run and thought she would win.

Harris had griped that the Biden White House often hung her out to dry when it came to fending off GOP attacks, and accused the 46th president of harping on a supposed slight against him to donors just before she took the debate stage against President Trump. 

But Jill insisted the Bidens went full tilt for her.

“Oh, all out,” Jill told interviewer Rita Braver on CBS News “Sunday Morning” about her efforts to get Harris elected. “I was out on the trail, I think every single day. I traveled the entire country.”

“[On] election night, I was certain she was going to win,” Jill went on. “The excitement for her and the crowds and, I mean, how people rallied around her, and I truly felt that she was going to win.”

“I was shocked she didn’t win, because I think she would be a good president.”

The former first lady added that “I went to bed” on Election Night and “I just, I couldn’t believe that she had lost.”

While Jill didn’t directly address Harris’ public gripes, the former first lady was adamant that she and her husband were fully behind the then-veep in 2024.

Harris didn’t feel the same way.

“When Fox News attacked me on everything from my laugh, to my tone of voice, to whom I’d dated in my 20s, or claimed I was a ‘DEI hire,’ the White House rarely pushed back with my actual résumé: two terms elected D.A., top cop in the second-largest department of justice in the United States, senator representing one in eight Americans,” Harris lamented in her book, “107 Days.”

Harris also groused about a pre-debate call she got from Joe, who was trying to ensure she wasn’t badmouthing him to donors. 

“My head had to be right. I had to be completely in the game,” the former veep wrote in her tome. “I just couldn’t understand why he would call me, right now, and make it all about himself.”

In her book, she also reflected that the 46th president’s decision to seek another term was “recklessness.” After the election, Joe had caused a stir on social media for being all smiles despite Harris’ defeat.

Harris, considered a top contender for the 2028 Democratic nomination, became the party’s first nominee in 20 years to lose the popular vote, while Trump received 326 Electoral College votes, the most by any GOP nominee since George H.W. Bush in 1988.

In the aftermath of the Democrats’ defeat, which came despite Harris raising $1 billion in the six weeks after the 46th president ended his bid for a second term on July 21, 2024, sources told The Post that “people didn’t connect” with the former senator and state attorney general of California.

“She was a s–t candidate and Trump made her look worse than Hillary Clinton,” one source said at the time, adding that Joe Biden “got pushed out for an empty pantsuit. At least Biden beat Trump and Hillary Clinton had more balls than either of them.”

Harris and Jill Biden have had an up-and-down relationship dating back to the 2020 Democratic primary campaign, during which Harris attacked Joe Biden over his past opposition to school desegregation busing.

“With what he cares about, what he fights for, what he’s committed to, you get up there and call him a racist without basis?” Jill Biden told supporters on a conference call. “Go f–k yourself.”

After Joe Biden secured the Democratic nomination, Jill reportedly came out strongly against choosing Harris as his running mate, complaining: “There are millions of people in the United States. Why do we have to choose the one who attacked Joe?”