At the Capitol recently, news broke that Republican presidential nominee Donald Trump had committed yet another blunder.

On Jan. 31, during the annual convention of the National Association of Black Journalists in Chicago, the former president questioned whether Vice President Kamala Harris, the presumptive Democratic presidential nominee, was black rather than Indian. Reporters scurried to find GOP pols for comment, and by 6:07 p.m., a knot of them formed a semicircle around Sen. Bill Cassidy (R-LA), who had walked off the Senate floor into a white marble hall that faces the Supreme Court.