A little over two months ago, Elon Musk found himself at Montsorrel, the palatial Palm Beach compound of Nelson Peltz, the famed activist investor. Mr. Musk knew the sprawling grounds well, having stayed in the guesthouse. But Mr. Musk had a darker message that spring day. Mr. Trump had to win, Mr. Musk said. Tesla, his electric car company, barely advertises, he said, but had still built a cult following through word of mouth.

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Persons: Elon Musk, Nelson Peltz, Musk, Peltz, Steve Wynn, John Paulson —, Biden, Trump, Tesla Organizations: Las Locations: Montsorrel, Las Vegas, America