FLINT, Mich. — Sen. JD Vance, who says his partnership with Donald Trump has cost him friends, is wrapping up his campaign for vice president by asking voters not to let their political differences come between them.

“I really don’t like Kamala Harris and her policies, but most of the people who are voting for Kamala Harris are fundamentally decent people,” Vance, R-Ohio, said in an interview aboard his campaign plane Monday. “I just believe that.”

It’s a belief Vance has…