President Biden recently went to New York to appear on “Late Night With Seth Myers.” On the show he was the same guy whom those of us who’ve spoken with him have seen: not a spring chicken, obviously, but lucid, well informed and moderately funny. The contrast couldn’t be greater with Donald Trump, whose ranting has become increasingly incoherent; after mixing up Nikki Haley and Nancy Pelosi a few weeks back, he has now once again appeared to confuse Biden with Barack Obama.

But not to worry: Trump recently assured an audience, “There’s no cognitive problem. If there was, I’d know about it.”

Oh.

Republicans aren’t going to acknowledge either Biden’s lucidity or Trump’s increasingly more noticeable lack thereof. But the reaction to the “Late Night” appearance that I found most revealing wasn’t about presidential age; it was about what happened next. Biden and Myers went for ice cream after the show, and

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