I hate to say it, but Donald Trump remains the singular most recognized name in the United States. Since he moseyed down that golden escalator in 2015, he has dominated the American airwaves and algorithms. Whether they hate him or love him, people know exactly what Mr. Trump’s shtick is.

This is why, despite every terrible consequence of his presidency, Mr. Trump’s approval rating has never much strayed from the mid- to low 40s for nearly a decade. No matter his divisive policies, Covid, the indictments, who his No. 2 was or whatever bile he spewed on social media, the jury of public opinion on Donald Trump is settled.

This is precisely Vice President Kamala Harris’s greatest political advantage in the next two months.

Since the early 1990s, political history has shown us that when a popular incumbent president is not on the ballot, we have a de facto change election. If Bill Clinton prevailed in 1992 on a message of change versus more of the same, if Barack Obama won in 2008 on the audacity of hope and even if Mr. Trump eked it out in 2016 on a blank promise to revive a relic of America, 2024 will be won by who is fresh and who is rotten. It’s quite simple: The shepherd of tomorrow wins the sheep.

But what’s not simple: We have an incumbent vice president running against a former president in a change election. From Labor Day to Election Day, to clinch victory and drive a nail into Mr. Trump’s political career, there are three imperatives Ms. Harris must drive at successfully to become the certified fresh candidate at the ballot box in November.

1. Help Mr. Trump hurt himself in the debate(s).

If there’s one thing Americans love, it’s a train wreck. That’s why we’re addicted to “Dance Moms” and the “Real Housewives” franchise. Just over two months ago, we witnessed one in real time, and it led to the humane revolt against a sitting president’s re-election campaign by his own party. I guarantee a lot of voters are salivating for a second round. Only this time, Mr. Trump must be the train wreck, and it’s on Ms. Harris to lay the tracks.