The strongest indicator yet that Hillary’s mulling a 2020 run? She appeared Wednesday, for the first time ever, on Howard Stern.

There was hardly a pretense she was there to promote the book she co-wrote with daughter Chelsea, long ago a bestseller.

As those who listen to the show know, Stern publicly begged Hillary to appear during the 2016 campaign. After Donald Trump won, Stern said one guest shot could have moved the needle her way.

“If she had come on the show . . .,” Stern mused in May. “The way I helped Donald was I let him come on and be a personality. Whether you liked him or not . . . people related to him as a human being.”

Hillary, it’s clear, was after exactly that — relatability, long her white whale.

One can only ask: Why now, if she has no plans to run yet again?

Sure, it’s possible she just loves being part of the national conversation. But of all the venues such a serious stateswoman could choose, one whose public presentation has been so carefully cultivated over decades, really: Howard Stern?

She hasn’t closed the door on 2020. Just this past weekend, during an appearance on the UK’s “Graham Norton Show,” Hillary said she’d been “deluged” with pleas to run again.

“I’d have to make up my mind really quickly,” she said, “because it’s moving very fast.”

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