The presidential campaign is entering its final weeks, and unless the polls are completely off, Donald Trump has very little chance of winning — only 7 percent, according to the Times’s Upshot model. Meanwhile, the candidate continues to say disgusting things, and analysts are asking whether down-ballot Republicans will finally repudiate their party’s nominee.

The answer should be, who cares? Everyone who endorsed Mr. Trump in the past owns him now; it’s far too late to get a refund. And voters should realize that voting for any Trump endorser is, in effect, a vote for Trumpism, whatever happens at the top of the ticket.

First of all, nobody who was paying attention can honestly claim to have learned anything new about Mr. Trump in the last few weeks. It was obvious from the beginning that he was a “con artist” — so declared Marco Rubio, who has nonetheless endorsed his candidacy. His racism and sexism were apparent from the beginning of his campaign; his vindictiveness and lack of self-discipline were on full display in his tirades against Judge Gonzalo Curiel and Khizr Khan.

So any politicians who try after the election to distance themselves from the Trump phenomenon — or even unendorse in these remaining few days — have already failed the character test. They knew who he was all along, they knew that this was a man who should never, ever hold any kind of responsible position, let alone become president. Yet they refused to speak out against his candidacy as long as he had a chance of winning — that is, they supported him when it mattered, and only distanced themselves when it didn’t. That’s a huge moral failure, and deserves to be remembered as such.