Whew. Can you have a debate in which nobody wins? The seven Republican presidential candidates on the stage during the GOP debate in Las Vegas Tuesday slapped, swatted, slashed, jabbed, picked, and poked at each other for two hours. As might be expected, most of the emerged bloodier and more ragged than when they walked in. But then, these things are contests—largely political sporting events. So if a winner must be crowned, make it Rick Perry, who showed some fire in his willingness to go toe-to-toe with Mitt Romney, whose aura of inevitability waxed and waned during the debate. Perry...