Trump chooses J.D. Vance as his running mate.

J.D. Vance. On Monday, former President Donald Trump announced freshman Sen. J.D. Vance (R-OH) as his running mate for the 2024 election. Before his election to the Senate, Vance was best known as the author of “Hillbilly Elegy,” which describes his experience growing up in a poverty-stricken home in Ohio. Vance, 39, is the first millennial nominated to either party's major ticket. If elected, he would become one of the youngest and least experienced vice presidents in U.S. history, with less than two years spent as an elected official.

Trump...