The Sunday news shows featured a rare spectacle that at once revealed the decline of civility in Washington and the depth of GOP outrage over Harry Reid’s unproven claim that Mitt Romney didn’t pay income taxes for an entire decade: two of the nation’s top GOP officials flat out called the Senate majority leader a liar. That’s no ordinary criticism in official Washington. There are plenty of other ways that pols use to call out their partisan rivals on their statements. Reid’s GOP counterpart, Minority Leader Mitch McConnell, for one, has already said Reid’s charge is “beneath the dignity” of...