O.K., Donald Trump won’t promise to accept the results of the election. That’s truly … good grief.

“I will tell you at the time. … I’ll keep you in suspense,” he told Wednesday’s debate moderator, Chris Wallace. The word “rigged” came up. Yow.

Hillary Clinton noted that Trump tends to presume that whenever he loses anything, the system was rigged: “There was even a time when he didn’t get an Emmy for his TV program three years in a row and he started tweeting that the Emmys were rigged.”

“I should have gotten it,” Trump retorted.

This is obviously what we should have known was coming when the host of “The Celebrity Apprentice” wound up as a presidential nominee. But jeepers, people, this is serious. Trump was refusing to acknowledge it was even possible for him to lose a fair fight. At one point, he announced the election was rigged because Hillary Clinton was in it. (“She should never have been allowed to run for the presidency based on what she did with emails.”)

The rigged-election moment overshadowed everything else in the debate, during which Trump made very strange faces while Clinton was talking, but did manage to avoid going completely off the rails. Does that make him a success? We are once again faced with the problem of the very, very low bar. Still, no.