In a series of social media posts in August, former President Donald Trump called Vice President Kamala Harris “low IQ,” “dumb” and lacking “the mental capacity” to debate him. Although a substantial majority of Americans subsequently concluded that she beat him in their Sept. 10 face-off, Trump doubled down. “Kamala Harris is mentally impaired,” he said at a rally in Wisconsin last month. “Joe Biden became mentally impaired. Kamala was born that way.”

In contrast, Trump — who often boasts about his undergraduate degree from the University of Pennsylvania, home of “super genius stuff” at the Wharton School, and the difficulty of getting admitted to that prestigious institution — maintains that “I’m a really smart guy, you know, really smart.”

Trump did not graduate with honors from Penn. Nor has he authorized release of his college transcripts. And it wasn’t that difficult for a transfer student (in this case, from Fordham) to get in more than 50 years ago.

Innate and acquired intelligence is clearly not Trump’s long suit. He has demonstrated a staggering ignorance about American history. He has alleged that the noise........

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