If you pay attention to these sorts of things, this is a pretty big deal. Normally, newspapers in big cities begin making their endorsements around this time, and a few of them are pretty much always going to support one party over another because of partisan lean. One of those papers, the Dallas Morning News, is going to break its tradition of endorsing the Republican this year because of who that Republican is.

The newspaper’s editorial board, which endorsed Ohio Gov. John Kasich in the Republican primary, ripped into Trump for his “admiration” of Russian President Vladimir Putin and disavowal of trade deals like the Trans-Pacific Partnership, as well as national security ideas that it says “put sound bites over sound policy.”

Trump’s ideas, the editorial board wrote, “are so far from Republicanism that they have spawned a new description: Trumpism.”

“We have no interest in a Republican nominee for whom all principles are negotiable, nor in a Republican Party that is willing to trade away principle for pursuit of electoral victory,” it concluded. “Trump doesn’t reflect Republican ideals of the past; we are certain he shouldn’t reflect the GOP of the future. Donald Trump is not qualified to serve as president and does not deserve your vote.”

That’s pretty much the same list of reasons many Republicans won’t fall in line and vote for the man. It’s not that he’s not Republican enough. Lord knows we’ve dealt with that before. It’s the fact that Trump isn’t Republican at all. He is, at best, a chameleon. And that’s infinitely worse for the movement than a liberal Republican.