It’s not hard to see what’s going on here. The congressman has been a thorn in this president’s side, and Mr. Trump sees attacking African American members of Congress as good politics, as it both warms the cockles of the white supremacists who love him and causes so many of the thoughtful people who don’t to scream. President Trump bad-mouthed Baltimore in order to make a point that the border camps are “clean, efficient & well run,” which, of course, they are not — unless you are fine with all the overcrowding, squalor, cages and deprivation to be found in what the Department of Homeland Security’s own inspector-general recently called “a ticking time bomb.”

In pointing to the 7th, the president wasn’t hoping his supporters would recognize landmarks like Johns Hopkins Hospital, perhaps the nation’s leading medical center. He wasn’t conjuring images of the U.S. Social Security Administration, where they write the checks that so many retired and disabled Americans depend upon. It wasn’t about the beauty of the Inner Harbor or the proud history of Fort McHenry. And it surely wasn’t about the economic standing of a district where the median income is actually above the national average. No, he was returning to an old standby of attacking an African American lawmaker from a majority black district on the most emotional and bigoted of arguments. It was only surprising that there wasn’t room for a few classic phrases like “you people” or “welfare queens” or “crime-ridden ghettos” or a suggestion that the congressman “go back” to where he came from.