It’s become a surprisingly familiar ritual this year: yet one more Democrat steps up and declares that he or she is running for president.

So, you would think that after nearly two-dozen times, the candidates would have it down and highly scripted.

And, for most of the Democratic herd, that’s just how it went.

But, for Democratic Candidate No. 23, his planned announcement went off the rails in a way that is any politician’s worst nightmare.

As the mayor of New York City, Bill deBlasio in some ways should have had the easiest campaign launch.

After all, he and his wife could make a camera-ready entrance just to walk to the street-level studio of ABC’s morning show, Good Morning America, and simply tell the entire nation he’s on the road to the White House.

And that’s where things just fell apart.

As deBlasio sat for his on-air interview, protesters just outside of the studio out on the street chanted, “Liar! Liar!”

Protesters specifically from the city police union started their own chant, “Can’t run the city! Can’t run the country!”

DeBlasio had to acknowledge that, and lamely called it “a little serenade.”

If all of that wasn’t bad enough, when they reported on his presidential campaign launch, news organizations included the results of a Quinnipiac Poll released Wednesday: 76 percent of New Yorkers don’t want deBlasio running for president.

Finally, of course, there was the de rigueur insult from the current occupant of the White House, fellow New Yorker Donald Trump.

Trump was quick to fire off on Twitter that deBlasio is “the worst mayor in the U.S.”

“He is a JOKE, but if you like high taxes & crime, he’s your man. NYC HATES HIM!” Trump added.

Any other Democrat fresh off their presidential launch would take that acid Trump tweet as a badge of honor. But after the morning he had, for deBlasio it probably felt like just one more kick in the teeth.