Ric Williamson, a former state legislator and longtime pal of Gov. Rick Perry, runs the monthly meetings of the Texas Transportation Commission like a traffic cop. Staff members give brisk status reports before Williamson dismisses them so the next bureaucrat can take the podium. If members of the public embark on a diatribe, Williamson will let them prattle on with an air of friendly indulgence. Then, rounding his shoulders and leaning forward—using body language no doubt perfected when he and Perry were freshmen state representatives harrying their elders—he’ll pleasantly announce that their time is up. As commission chairman, Williamson sits...