In an election cycle with a sitting vice president suddenly elevated to become her party’s nominee, and a former president, now the challenger, grazed by an assassin’s bullet, the American people have gotten a crash course in why veeps matter, whether it’s Tim Walz or J.D. Vance.
On the Republican side, Donald Trump at age 78 is the oldest person to run for president. He got a lot of mileage out of making fun of President Biden as...