CLEVELAND. It was billed as The Donald Trump Show, and the Republican front-runner delivered. He mugged. He pouted. He projected outrage without being troubled by specificity or fact. When he got punched — and the moderators threw haymakers all night — he stuck out his chin and punched back. Trump made it through the first Republican debate by avoiding the one mistake that could have seriously damaged his insurgent campaign: sounding like a professional politician. For that reason alone, he seemed to me the clear winner. I watched the debate at the House of Blues in downtown Cleveland with a...