Charles Koch, photographed in his Wichita, Kan., home Credit: WSJ

Four days before this year’s presidential election, Charles Koch—the voluble Kansas billionaire who has spent a fortune injecting his particular brand of prairie libertarianism into the American political debate—pauses at the other end of the line when asked if he will vote for Donald Trump or Joe Biden.

“That’s a very divisive question, because however I answer, that’s going to upset a bunch of people,” he says. “That’s why there’s a secret ballot.”

Mr. Koch, whom Forbes calls the 15th-wealthiest man in the U.S., says he isn’t interested in more division. At age 85, he says, he is turning his attention to building bridges across partisan divides to find answers to sprawling social problems such as poverty, addiction, recidivism, gang violence and homelessness. His critics are skeptical, noting that his fierce Republican partisanship over the years blew up a lot of bridges.

Mr. Koch has written (with Brian Hooks) a new book, “Believe in People: Bottom-Up Solutions for a Top-Down World,” which will be published on Nov. 17. It is part mea culpa, […]

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