If Tuesday’s vote in Wisconsin goes according to the polls, Donald Trump’s remarkable ride to the Republican nomination will crash into a wall. And if he never recovers his momentum, the postmortems will say his front-runner status was an illusion befitting a modern P.T. Barnum.

The postmortems would be wrong. Trump might well be stopped, but not because his campaign is a fraud. It’s because he’s blowing it.

Trump’s self-destructive conduct has me wondering whether he has a Gary Hart problem. No, not a “Monkey Business” secret, but a similar penchant for snatching defeat from the jaws of victory. The men are alike in using a hostile media to commit political suicide.

Hart, a former Colorado senator and the Democratic front-runner early in the 1988 presidential campaign, ended his promising career by spending a night with an attractive young woman not his wife. He tempted fate even as “womanizing” rumors dogged his campaign, and fate won.

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Michael Goodwin is a Fox News contributor and New York Post columnist.