Is Elon Musk running for president?

Of course not. A South African-born billionaire, Mr. Musk cannot legally run and, anyway, he has invested over $75 million in trying to get Donald J. Trump elected.

Somehow that mission brought Mr. Musk, the world’s richest person, to a high school auditorium in suburban Philadelphia on a surreal Thursday evening where, if you blinked, you might have forgotten momentarily that he was not the candidate himself.

There was a military-grade security apparatus that protected his every movement. There was a crowded press riser, crummy Wi-Fi (at least for those who couldn’t procure the secret Starlink password), and a well-organized advance staff on headsets and production aides wielding professional video cameras. There was a giant American flag in the middle of a stage and a country and rock playlist straight out of a town hall in Iowa or New Hampshire during the Republican nominating season.

Mr. Musk walked onto the stage to Brooks & Dunn’s “Only in America,” a staple of Trump campaign rallies. “I haven’t been politically active before,” he said to a rapturous and sometimes rowdy crowd. “I’m politically active now because I think the future of America, the future of civilization is at stake.”

Mr. Musk was there to encourage Pennsylvanians to “go hog wild” on voter registration and to convince their friends to sign up before the state’s deadline, on Monday. But, still, much of the event ended up being about himself.

Never known for his humility, Mr. Musk is betting on his own persuasive powers to help Mr. Trump win, just as he has bet on himself during existential crises at his companies, like X, SpaceX and Tesla. Mr. Musk has described Pennsylvania as the “linchpin” to Mr. Trump’s hopes of returning to the White House.

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