WASHINGTON: Good riddance to Campaign 2016, the election that put the “ugh” in ugly.

Headed for history books a week from Tuesday, the duel between Hillary Clinton and Donald Trump became a battle of “nasty women” and “bad hombres” vs. “deplorables” and voters who are “irredeemable.”

A beauty queen, a Gold Star family, an ex-president and his baggage, the FBI director, even the pope were drawn into the fray.

At times, the campaign rhetoric has been so raunchy it’s forced middle-school civics teachers to censor their lesson plans. Thank Trump for that. But Americans can’t say they weren’t warned about what lay ahead.

On June 16, 2015, mere minutes into a rambling campaign announcement speech, Trump was labeling Mexican immigrants as rapists and criminals, and pledging to build “a great, great wall” to keep them out. He’s been horrifying and-or delighting people with his provocations ever since.

Clinton, by contrast, strode into the Democratic race two months earlier with a commanding resume and a sunny announcement video that instantly made her the presumed heir apparent for her party’s nomination. She looked poised to finish the business of shattering “that highest, hardest glass ceiling” she couldn’t quite reach in a 2008 race against Barack Obama.

And thus the table was set for one of the nastiest, soul-crushing presidential campaigns in history.

In the end, no matter who wins, the next president will be one of the most unpopular ever.

“If the central promises of modern politics are peace and prosperity, we really haven’t had either for a long time,” said William Galston, a Brookings Institution scholar and former official in Bill Clinton’s administration. “That created an atmosphere of discontent and protest that affected both political parties this year.”

The primaries gave us taco bowls, penis jokes, penis boasts and schoolyard nicknames.

Forget debating the issues. People debated whether Trump was prone to blurting out “bigly” or “big league.” (It’s the latter.)

No one could trump Trump, with his never-ending fusillade of insults and bluster.

He dissed Sen. John McCain’s history as a Vietnam prisoner of war, mocked Fiorina’s face, and deemed Pope Francis’ criticism of building walls “disgraceful.”

He proposed a “total and complete shutdown” of immigration by an entire religious group — Muslims — to fight terrorism, only later morphing the idea into a call for “extreme vetting.”

For all of that, it turned out that it was Trump, incongruent in his suit and red ball-cap, who best channeled the anger and disaffection percolating among Americans fed up with establishment politics.