Silly, silly Donna Brazile. She’s publishing a book detailing turmoil in the Democratic Party during the 2016 campaign, highlighted by her concern that Hillary Clinton was seriously ill and might need to be replaced by Joe Biden or Bernie Sanders.

What’s the big deal? There’s no news here because all this was well-known and covered at the time by the big national newspapers and networks, right?

Wrong. If Brazile were rehashing things we knew, there would be no book and no bombshell headlines now.

Instead, she has thrown open a new and very big window on 2016 — and exposed yet again the consequences of the political biases of the Democratic media.

The missed stories are not merely the result of mistakes or sloppy reporting. Brazile’s book is a revelation in that it shows that many left-leaning journalists didn’t so much cover Clinton as cover up for her.

Put it this way: How is it possible that the leader of the Democratic Party was talking to colleagues about trying to replace its nominee during the general election because of health concerns, and none of the thousands of journalists covering the campaign got wind of it?

It’s not possible — if the media had been playing it down the middle and holding both candidates to the same standard of scrutiny. But big media missed a big story because so much campaign “news” coverage was tilted toward defeating Donald Trump and electing Clinton.

Anything that could possibly suggest Trump was unfit for the Oval Office — bingo, front page, top of the broadcast.

On the other hand, anything that could hurt Clinton was downplayed or ignored. Nothing to see here, move along.

The coverage of Clinton’s health was a prime example of the tilt. Her coughing fits, especially a long one on Labor Day, and a history of falling were pointed out by the popular Drudge Report, some Republicans and smaller, conservative-leaning sites to suggest she was not being honest about her health.

But her campaign always denied anything was wrong — allergies, the candidate and her flacks insisted, caused the persistent coughs, and major news organizations mostly nodded their heads and stayed mum, accepting the official denials without skepticism.

The dam cracked a bit on Labor Day, when an NBC reporter filed a 91-word, four-paragraph story that said Clinton had been unable to finish her speech in Ohio because of a coughing fit.

The truth was dangerous, so the Praetorian Guard sprang to Clinton’s defense. The NBC reporter, Andrew Rafferty, was mocked and insulted, first by the campaign, and then by journalists, including some MSNBC commentators who turned on their colleague as if he had violated a secret oath.

CNN joined the Clinton amen chorus, and at the Washington Post, political writer Chris Cillizza denounced the topic of Clinton’s health as “a totally ridiculous issue” and declared it a “sure-fire loser” for Trump.

“It’s hard to plausibly insist, based on the available data, that Clinton is ill,” insisted Cillizza, who is now at CNN.

Five days later, Clinton was unable to walk on her own and collapsed at the 9/11 ceremony in Manhattan as she tried to get into a van. The campaign insisted she was just “dehydrated” until a short video of the incident aired, then admitted the candidate had been diagnosed with pneumonia days earlier.

In other words, the claim of allergies was a big fat lie. That prompted Brazile to contemplate starting the process of replacing Clinton, writing in her book that the campaign also was “anemic” and had “the odor of failure.” She says she considered numerous tickets to replace Clinton and Sen. Tim Kane, and decided that Biden and Sen. Cory Booker (D-NJ) would be the best.

It’s not clear how long she deliberated or how many people she talked to, but Brazile writes that Biden called her on Sept. 12. In the end, she says, she made no move because she couldn’t disappoint Clinton’s supporters.

Her book is called “Hacks: The Inside Story of the Break-ins and Breakdowns That Put Donald Trump in the White House,” and it’s got lots of other juicy bits, including evidence that the party rigged the primaries to help Clinton beat Sanders and that Clinton possibly broke federal campaign finance laws by scooping money donated by big donors to state parties, far in excess of individual federal limits.

Brazile also writes that the Clinton team treated her like “a slave,” and she accuses its male hierarchy of sexism.

As is their wont, the Clinton campaign is attacking Brazile, saying she fabricated incidents just to sell books. But curiously, the candidate herself has been silent.

Presidential campaigns, of course, are grueling, dynamic events and infighting is common. But what is extraordinary here is the fact that none of the huge moments Brazile recounts has been reported before.

That would matter less if the media humbly acknowledged it missed major stories that could have rocked the race, but that’s apparently expecting too much from news organizations that have forfeited their public trust. Nothing has changed, with the anti-Trump bias firmly intact.

Still, Brazile’s book is timely, with today the anniversary of Trump’s smashing upset. It is a reminder that, thankfully, voters weren’t fooled by the media conspiracy to hide the truth.

Gray Lady hasn’t a ‘preyer’

An op-ed in the New York Times headlined “The Deep Confusion of the Post-Weinstein Moment” celebrated the way women are becoming emboldened to name their powerful abusers instead of staying silent. I was agreeing with the author that it is a welcome cultural change we are witnessing — until she spoiled her piece by twisting it with politics.

The writer, novelist Naomi Alderman, made three mentions of the sexual accusations against President Trump last year, but skipped the most famous sex case in the history of politics — the one involving a sitting president by the name of Bill Clinton and a young intern. Nor, having blasted Trump and his supporters, did she mention Harvey Weinstein’s prodigious fundraising for Democrats, or the way Hollywood liberals protect predators.

Left not right again on guns

The military screw-up that allowed the Texas killer to buy his weapons is a perfect example of how the failure to enforce laws often leads to horrible tragedy — and yet still provokes calls for ever more laws.

If the Air Force had done what it is supposed to and told the FBI that Devin Patrick Kelley had been dishonorably discharged after beating his wife and cracking the skull of his infant stepson, he would not have been allowed to purchase any firearms legally. But the Air Force never made the crucial notification, and Kelley passed all background checks as he assembled his small arsenal.

Still, the demand for more gun control, any gun control, dominates the left’s reaction.

Don’t facts matter?

Raw-cous roadies

Headline: “Canadian Mounties arrest 5 naked people after car crash.”

Here’s a shock: Police believe drugs or alcohol were involved.