Every successful politician follows roughly the same path: First, they become prominent on some stage. They become more successful, maybe graduating to a larger stage. Then, eventually, they peak and decline, with the affection of even their strongest supporters cooling somewhat.

If they are lucky (Harry Truman, George H. W. Bush), they eventually experience some historical revision that burnishes their reputation. (If they are very lucky, they even live to see it.) If they are not (Herbert Hoover, Richard Nixon), they don’t. This happens whether a politician’s departure from office comes in defeat at the polls or at the top of their popularity, as with Bill Clinton, who has seen his reputation suffer—personally and politically—in the past 15 years.

Along with election results and norms of basic decency, Donald Trump continues to defy this pattern. Not only was the former president nationally famous before he entered politics, but he has always been unpopular with most Americans and very popular with his base. From early in his presidency through to the present, nothing has changed the fundamental picture. That stability is now the key to understanding the 2024 Republican nomination race.

[David A. Graham: The Republican primary’s Trump paradox]

The prospect of a rematch between Trump and Joe Biden has demoralized and baffled commentators. “Not Biden vs. Trump Again!” moaned a recent headline on the political-science site Sabato’s Crystal Ball. “It won’t be pretty. It may not be inspiring. And it will mostly be about which candidate you dislike more,” warned Doyle McManus of the Los Angeles Times. “How did a once-great nation end up facing an election between two very old, very unpopular White dudes?” groaned The Washington Post’s Megan McArdle.

The answer in Biden’s case is relatively straightforward: Incumbent presidents basically never lose the nomination (though shockingly high polling for known crank Robert F. Kennedy Jr. illustrates the dissatisfaction among Democratic voters). Trump is a more interesting case, because he is not president, has never successfully won the popular vote, and lost the previous election—to say nothing of his attempt to steal the election afterward.

These are the ingredients for a politician to lose his support and slink from the scene. No popular groundswell demanded that Gerald Ford run in 1980, nor Bush in 1996; only inveterate op-ed-page contrarians such as Doug Schoen clamored for Hillary Clinton to run again in 2020 (or 2024, for that matter).

Yet Trump hasn’t lost luster, partly because he never had much luster to begin with. Since March 2017, with a brief exception, more than half of Americans have disapproved of Trump (during his presidency) or held an unfavorable opinion of him (since he left office), according to FiveThirtyEight’s poll averages. (He very briefly dipped into mere plurality disapproval early in the coronavirus pandemic.)

One half of the equation is that it’s hard to become unpopular when you were already there. The other half is that it’s hard to become more unpopular when your supporters are so devoted. In a recent YouGov/Economist poll, 84 percent of Republicans had a favorable view of Trump; Quinnipiac pegged the number at 86 percent.

This kind of split might have been impossible in past decades, because it would have spelled electoral doom: To win the nomination in politically heterogeneous parties, a candidate had to appeal broadly. But in today’s ideologically sorted and affectively polarized parties, a candidate can win the nomination and then rely on their party’s voters to coalesce around them and guarantee 47 to 49 percent of the vote. (Of course, it’s that last little increment to a majority or plurality that makes all the difference in the end.)

Ron DeSantis only formally entered the race in May, but he appears to be sputtering. At the same time, the primary is expanding, as more Republicans enter the race or seriously consider it. One explanation for this is that DeSantis just hasn’t been a very good candidate: He looks clumsy and leaden on the trail, and he’s failed to differentiate himself from Trump in a way that appeals to enough voters. That’s encouraged other Republicans to make a plan for the mantle of Trump alternative.

But the problem facing either DeSantis or any of the others is not that the right Trump alternative hasn’t emerged but that most Republicans don’t want a Trump alternative. They want Trump. The depth of affection for Trump is appalling, given that his first term in office was morally and practically disastrous and ended with an attempt to steal the election and an exhortation to sack the U.S. Capitol. But Republicans continue to love him; it’s not debatable.

DeSantis, cautiously, and former New Jersey Governor Chris Christie, more Christiely, have tried to get around this by arguing that Trump is a loser: He lost in 2020, he led the party to losses in 2018 and 2022, and he barely avoided losing in 2016. This is a tricky balance to strike, because it requires convincing Republican voters that the guy they voted for twice, and whom they still like, is a loser—especially compared with Christie, who lost badly to Trump in 2016, and DeSantis, who is losing badly to Trump this time. The easy retort is the same one for Bernie-would-have-won types after 2016: If he would have won, then why didn’t he? In this case, why aren’t you winning now?

More important, this argument will fail to convince Trump supporters because they believe he’s actually the most electable candidate. A Monmouth poll released Tuesday finds that almost two-thirds of Republicans think the former president is definitely or probably the candidate best positioned to defeat Biden. Trump critics will scoff at this, but then again, Trump’s victory in 2016 is proof that unpopularity isn’t politically fatal.