Since a reprehensible rogue like Donald Trump has zero chance of being elected President, or even nominated, we should all sit back and enjoy the spectacle. Especially Democrats.

If Trump gets on the debate stage, the GOP contest becomes a clown-car demolition derby.

His announcement was a triumph of untrammeled egomania. “I’m really rich,” he boasted. Unlike the “losers” who run the country.

He called himself the “most successful person ever to run for the presidency, by far.” Mitt Romney? Trump bragged that he owns a “Gucci store that’s worth more than Romney.”

Obviously, The Donald doesn’t see success as something like, say, commanding the Allied military forces that conquered Germany. Or winning the American Revolution.

All of which is why he is the most unpopular man ever to run for President. One poll found that seven in 10 voters view him unfavorably. So do 52 percent of Republicans.

It’s the Republican candidates who stand to lose. Trump might attack them all at a debate. Yesterday, none of them had the guts to stand up to his bullying.

An RNC spokesman called Trump “a successful businessman.” He added, “We’ve got a number of high-caliber candidates running in this cycle.”

Rand Paul’s campaign said, “He’s clearly been a successful businessman, and the more the merrier.”

Mike Huckabee gushed, “I personally like him and I’m glad that he joins me in pointing out that we need to hold China accountable for their end of trade deals and currency manipulations.”

Ted Cruz praised “his experience as a successful businessman and job creator.”

This is going to be rich, really rich. Just like The Donald.