THEY DESERVE EACH OTHER (AND SO DOES CALIFORNIA), BUT I DON’T KNOW WHAT AMERICA DID TO DESERVE THEM: The Kamala-Gavin rivalry builds to possible 2028 showdown.

Why it matters: Their public niceties toward each other cloud a longtime, behind-the-scenes tension that’s beginning to surface as both weigh runs for president.

Zoom in: Harris set off rare public sniping between the pair last month when she took a dig at Newsom in her new book “107 Days,” about her short run for president in 2024.

After then-President Biden dropped out of the race in July, Harris called Democratic lawmakers to ask for their endorsement.

She wrote in her book that when she reached Newsom, he said he was hiking and would call her back.

Newsom did post his endorsement online hours later, but Harris wrote that Newsom never called back.

Newsom recently said he privately asked Harris why she didn’t mention in her book that he had quickly endorsed her, and she responded: “On book tour. Get back to you later.”

Harris has been using her tour to argue that even with only a 107-day campaign, she got close to beating Donald Trump.

Newsom, meanwhile, told Stephen Colbert last month: “As the Democratic Party, we have a lot of work to do to make up for our failures in the past. We got crushed in this last election.”

Much more at the link, plus this: Kamala Harris’ flaws on full display during her tour de farce book tour.

The thing about being a monied Democrat coming up in California politics is that you’re left completely unprepared for actually having to compete for voters.

If you thought Harris was bad on the national stage — and she was — I get the feeling that Newsom is going to look like the Boy in Bubble spending his first day out in a Wuhan lab.