Presidents and those who would be president often boast of their qualifications — their education, their experience, their achievements. And then there is President Trump, who is boasting about his dementia test.

Even for a president who has rewritten the political rule book so many times before, the spectacle of a commander in chief repeatedly touting his performance on a cognitive examination to prove that he has not lost a step paves new ground in the history of campaigns for the highest office in the land.

Rather than dispensing with the issue, Mr. Trump drew new ridicule this week when he declared it nothing short of “amazing” that he did so well on a test that, among other things, required him to identify an elephant. To demonstrate just how hard he said the test really was, he went on television to recite, over and over, the words that he had been asked to remember in the right order: “Person. Woman. Man. Camera. TV.”

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