It’s the presidential seal of approval.

Former President Barack Obama’s newly revealed call with mayoral frontrunner Zohran Mamdani is a nod that could help the socialist more palatable to panicking high-level Democrats , insiders tell The Post.

Details about the June call — first reported by New York Times staff writer Mara Gay Wednesday and confirmed by The Post — remain vague, but its disclosure appears to be part of an effort to persuade hold-out Big Apple voters that Mamdani is not a fringe candidate.

“It gives the sense that President Obama’s world is comfortable with his candidacy. It normalizes him,” the Rev. Al Sharpton , who had close ties with Obama’s White House, said Thursday.

“It helps with the perception of some people that Mamdani is too radical. It sends a mess

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