At long last, House Republicans finally selected their new speaker: Mike Johnson, the Shreveport native who resembles nothing so much as the pale casseroles ubiquitous to Baptist fellowship halls across the American South. They could be white cheddar cheese and boiled potatoes, they could be whipped cream and banana with Nilla wafers — you won’t know ’til you take a scoop, but you won’t have to chew very much to enjoy it.