“This year, the choice isn’t between two capable major party nominees who happen to have significant ideological differences. This year, one of the candidates — Republican nominee Donald Trump — is, by unanimous consensus of the Editorial Board, unfit for the presidency.”

This paragraph, from USA Today’s editorial “Trump is unfit for the presidency,” is not an outlier. It reflects yet another oddity of the 2016 election cycle: The unprecedented shunning of a major-party nominee by nearly every widely read daily publication in the country.

Of the top 100 daily newspapers ranked by 2016 circulation, 55 have endorsed Hillary Clinton. Only one, the Las Vegas Review-Journal, has endorsed Donald Trump.

For many newspapers, this hardly comes as a surprise; The New York Times, for instance, has endorsed a Democrat in every presidential race since 1960. But for others, a Clinton endorsement is truly off-brand. Six major papers — The Dallas Morning News, Arizona Republic, San Diego Union-Tribune, Columbus Dispatch, Omaha World-Herald, and Cincinnati Enquirer — are each breaking a streak of Republican endorsements going back 32 years or more to choose Clinton. Other reliably conservative editorial boards are instead siding with Libertarian Gary Johnson, or simply refusing to pick a candidate. And USA Today, the highest-circulation daily newspaper in the country, is stepping into the endorsement game for the first time with the “anti-endorsement” of Trump quoted above.

Just how ahistorical is this? I used historical endorsement data since 1980 compiled by the data journalist Noah Veltman to quantify a sort of “surprise factor” for newspaper endorsements.

For each paper, I calculated an “expected endorsement” ranging from 0 (definitely the Democrat) to 1 (definitely the Republican) based on that paper’s endorsement record, weighted toward recent elections. Given that we have a two-party system, I counted any third-party endorsement or non-endorsement as a 0.5, and any anti-endorsement as an endorsement of the opponent (though not every editorial board would agree with that interpretation).

I found that Clinton has outpaced her expected endorsements by 36 percentage points, a wider margin than any other candidate since at least 1984. According to our method, she should have expected 54 percent of endorsements but has received 90 percent instead.

And even this is being a bit unfair to Clinton. Barack Obama in 2008 was the second-most “over-endorsed” candidate in the data set, making 2008 and 2012 among the most left-leaning endorsement years on record. So (because of the weighting method) Clinton had a high expectation bar to clear — and she cleared it by an unprecedented margin. On the other hand, the data shows a leftward trend in newspaper endorsements since the Reagan era, so it’s possible that our expectation hasn’t caught up sufficiently.

What accounts for this blowout in newspaper endorsements? It wouldn’t be 2016 without mentioning Trump’s pet theory: “Media rigging election!” The Trump campaign and pro-Trump media outlets have argued that there is a clear media bias. They claim not only that the media is liberal — journalists, as a group, do lean left — but that the media is explicitly working with the Clinton campaign (and other entities) to defeat Trump.

But there’s a simpler explanation than deliberate rigging. Reading through the endorsements, I found surprisingly little mention of the candidates’ ideologies or even policy preferences. Instead, many editorial boards focused on the personal qualities and histories of the two candidates. As Newsday wrote of Trump:

He has an astonishing lack of knowledge about the world and about how government works. Worse, he shows no curiosity to learn. His stunning refusal Wednesday night to say he will accept the results of the election undermines one of the hallmarks of our democracy. And he has no peer in his ability to spout untruths. If that weren’t enough, his temperament disqualifies him. He wants to be president like it’s a trophy to be won, and he would have others do the actual work. That is not leadership.

So perhaps Clinton’s unparalleled landslide in newspaper endorsements is reflective not of ideological bias, but of general agreement among journalists — conservative as well as liberal — as to the qualities that make a candidate fit or unfit for the presidency.

Of course, this explanation offers little consolation to those Trump supporters who feel the news media is rigged against them. From the outside, consensus and conspiracy look awfully similar.