San Francisco Democrats Gavin Newsom and Kamala Harris may publicly sing each other’s praises — but the frenemies are privately at each other’s throats as they both eye a 2028 White House bid.

The two star Dems may be careening towards a “murder-suicide,” as one advisor once put it to the San Francisco Chronicle, if both decide to run for president, as petty feuds over book sales, a “hiking” snub and Harris’ decision to stay out of the California governor’s race boil over behind closed doors.

Newsom and Harris are at the top of 2028 Democratic presidential polls in what could be their first head-to-head competition since they both launched their careers in San Francisco more than 20 years ago. 

“They’ve been kind of like two cats, circling each other in an alley for years, politically speaking,” Democratic strategist Garry South, who worked for Newsom, told the Wall Street Journal. 

The longstanding rivalry between them erupted when the two released memoirs within months of one another, sources said. 

Newsom and Harris kept watch on one another’s book sales: Harris’ book released in September, “107 Days,” has sold roughly 385,000 copies while Newsom’s “Young Man in a Hurry” has sold more than 100,000 since its February release, the WSJ reported. 

The California governor felt Harris made him look like a jerk when he had actively stumped on her behalf and even gave her a rousing introduction at the 2024 Democratic National Convention in Chicago.

The personal tension only deepened after Harris declined to run for governor — a race many Democrats believe she could have easily won — while continuing to tease another run for president.

“She knew he was going to run for president,” the source close to Newsom told The Post. “What he was hoping she would do is have the common sense to run for governor.”

Harris said in April she “might” run for president, while Newsom has indicated he’ll make a decision sometime after the November midterm elections.

Former San Francisco Mayor Willie Brown helped launch both Newsom and Harris’ careers starting in the 1990s. He appointed Newsom to the Board of Supervisors in 1997 and briefly dated Harris in the mid-90s, helping her eventually become district attorney.

it’s no secret which San Francisco protégé Brown thinks has the juice to win in 2028.

“[Harris’] failure, once she ran for president with the ticket of Biden, was an ultimate disaster,” Brown said in an interview. “And then her book did not enhance in any way that failure.”

A source close to Harris insisted she did not see the Newsom anecdote in “107 Days” as a hit job, just a fact. 

“All of the chronicling of what people said that day — she didn’t editorialize,” the source told The Post.

“There are a lot of things in [Harris] book that people were rightfully like, whoa.” 

Newsom allies were less charitable, describing Harris as “vindictive” — a trait they said goes back to her days as San Francisco district attorney, when Newsom was mayor.

“She’s the kind of person who will still stick a pin in your ass if she doesn’t like you,” a source close to Newsom said.