Joe Scarborough has a bad habit of riding verbal hobbyhorses into the ground. As we've often documented, as here and here, once Joe gets what he thinks is a catchy phrase into his noggin, he repeats it—ad nauseam. Scarborough's hobby horse o' the morning on today's Morning Joe was accusing Republicans of "standing in the schoolhouse door," with an explicit reference to George Wallace, who infamously blocked desegregation in such manner. Scarborough uttered his "schoolhouse door" line no fewer than seven times, with Al Sharpton chipping in for an eighth edition. Scarborough was outraged that Republicans, led by Mitch McConnell,...