The Maryland political establishment– by far the zaniest left-wingers in state and local politics in America – is in a state of hyperventilation and panic over a new television ad by Governor Rick Perry of Texas.  Tired of every last dime being wrung out of your business by Maryland taxes?, asks the governor, “then think about Texas.”  It’s always a good thing for society, but bad for our rulers, when at least one of them decides it’s a good idea to compete by lowering taxes.  (Maryland state government is so tax crazed that it recently imposed a “rain tax” based on the size of the roof....