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(FILES) In this April 25, 2013 former US Presidents George H.W. Bush and George W. Bush attend the George W. Bush Presidential Center dedication ceremony in Dallas, Texas. Former president George H.W. Bush plans to vote for Hillary Clinton in November, the niece of president John F. Kennedy wrote in a September 20, 2016 Facebook posting. "The President told me he's voting for Hillary!!" read the caption of a picture Kathleen Kennedy Townsend posted on Facebook, as she shook the 92 year-old ex-president's hand. / AFP / JEWEL SAMAD Image Credit: AFP

Former United States president and Republican H.W. Bush is planning to vote for Democratic candidate Hillary Clinton in the American presidential election. That’s not considered major news by most mainstream outlets. But it should be.

The story, first picked up by Politico late last Monday night from a Facebook post by Kathleen Kennedy Townsend, the former Maryland lieutenant governor, got almost no play, for example, from the New York Times. It created only a very small flurry of interest on Twitter, at least judging from my feed.

The only previous exceptions after former president Franklin Roosevelt to the norm that former presidents support their party’s nominee were presidents who were aged, one former president — Richard Nixon — whose support wasn’t wanted, and one instance in which former president Jimmy Carter failed to endorse Bill Clinton’s re-election in 1996.

Now neither former president Bush is supporting the Republican nominee, with the senior Bush actually crossing party lines to vote for Hillary. They’re joined by the 2012 Republican nominee, Mitt Romney, meaning that three of five living former Republican presidential nominees have opted not to support their party nominee. And there’s a long list of important, albeit not quite as prominent, Republicans who won’t support Trump, some of whom are supporting Hillary. That’s not even counting those who grudgingly support “the Republican nominee” without saying his name, or in some cases without being willing to say he’s qualified for the job.

It’s extraordinary. The last time anything at all similar happened was in 1972, when many leading Democrats deserted George McGovern. Sure, there are always a handful of cross-party endorsements in every election, but nowhere near this number, and many of them in normal years turn out to be either very conservative Democrats backing Republicans or very liberal Republicans backing Democrats.

It’s also the best evidence, from people who follow politics closely and presumably care about both the fate of the Republican Party and of America, that Trump really isn’t a normal potential president. These stories are the easiest way to show just how different Trump is from a normal nominee — something reporters have struggled to demonstrate.

After all, every presidential candidate lies, as Hillary famously did about sniper fire on a tarmac once; it’s hard to differentiate that from how Trump is unusually untrustworthy. Any candidate can be caught with a knowledge gap or botch a question, as Gary Johnson did about Aleppo and the New York City bombs recently; it’s hard to show that Trump is unusually ignorant about politics and world affairs.

Many candidates also have faced some questions about their personal finances; Trump is off the scale on that one, too (as can be seen in everything from the latest reporting on his personal “charitable” foundation to the lawsuits alleging that Trump University was a scam).

And plenty of candidates have made an ugly remark at some point or have been accused of using dog whistles to appeal to hatred, so how to show that the bigotry at the core of Trump’s campaign and his political persona are far more serious?

The cold hard fact is that elite Republicans flee from him precisely because of any or all of these four disqualifying attributes — that he can’t be trusted, that he doesn’t have the information base to do the job, that his business and personal finances are a mess, and that he’s running as a bigot.

In other words: Trump is different. He’s not a normal candidate. His candidacy is untenable, according to those who have the strongest incentives to get it right.

Whether that information would matter to voters is an open question. I’ve seen plenty of people mock at the idea, but I think there’s a good chance some Republicans would see it as a fairly strong cue. Regardless, Republican disunity and defections may be the single strongest way to demonstrate something absolutely central to understanding this election: Why Trump isn’t just a show-business version of a regular candidate.

— Bloomberg

Jonathan Bernstein is a Bloomberg View columnist covering US politics