They no longer have any need or desire to be statesmen And, as with everything else, it’s a long, slow evolution that’s been accelerated at warp speed by the presence of Donald Trump in American politics: There are 26 Republican governors. Three of them showed up here this week at the annual summer meeting of the National Governors Association. And of those three, one left after the first night, and another had little choice but to attend — his chairship of the group began at the conclusion of this year’s gathering. Striding the Hard Rock Cafe casino stage like a megachurch pastor, Utah Gov. Spencer Cox used his maiden speech as NGA chair to implore his fellow governors to make the organization a model of robust yet civil debate. “If we’re ever going to find our better angels again, it has to start with us setting the example of how to disagree better,” Cox said. But it’s hard to do much disagreeing, or have a conversation at all, when nobody is listening: Fewer than a half-dozen governors were still in attendance for his remarks Friday, the session’s closing day, and they were all Democrats. After more than a century of bringing together the nation’s governors, the NGA — long a wellspring of ideas, forum for best practices and platform for innovating policymaking — is at grave risk of falling victim to the silos plaguing most every other element of American politics. That’s the bad news. The good news is if…