Security: It's bad enough that a fine congresswoman is shot down by a crazed assassin. But do those whose job it is to prevent such awful things have to insert their own base politics into the tragedy? As a key law enforcement figure in the assassination attempt against Arizona Rep. Gabrielle Giffords, Pima County Sheriff Clarence Dupnik, a Democrat, might be expected to show some caution in commenting on the violent swirl of bitter, unsubstantiated and outright false accusations made by Democrats on the left against the Tea Party, Sarah Palin and conservative bloggers. Blaming the Tea Party or Sarah...