But you would have expected such a coup to be carried out in the name of electability, and Trump doesn’t clear that threshold either. Instead his general-election numbers and favorability ratings are so flagrantly terrible that he’d probably put a raft of red states in play. In other word, he’s untrustworthy and unelectable — a combination that you’d normally expect engaged partisans to consider and reject. And yet he’s winning anyway.

But here the model isn’t completely broken, because a majority of Republican voters don’t actually believe that Trump faces long odds, don’t agree that he’s less electable than Cruz or Kasich (or Rubio or whomever further back). Instead, since last fall Republican voters have consistently told pollsters that they think Trump is the candidate most likely to win in November. So the party’s voters are choosing electability — as they see it — over ideology; they’re just in the grip of a strong delusion about Trump’s actual chances against Hillary Clinton.

The reason for this delusion might be the key unresolved question of Trump’s strange ascent. Is it the fruit of Trump’s unparalleled media domination — does he seem more electable than all his rivals because he’s always on TV? Is it a case of his victor’s image carrying all before it — if you win enough primary contests, even with 35 percent of the vote, people assume that your winning streak can be extended into November? Is this just how a personality cult rooted in identity politics works — people believe in the Great Leader’s capacity to crush their tribe’s enemies and disregard all contrary evidence?

Or is it somehow the pundits’ doing?