When the school bully starts glowering in your direction, the worst thing you can do is hold up your hands and say, “Please don’t hit me.†It’s a lesson most of us learn in the schoolyard, but one that Texas Sen. Ted Cruz seems to have forgotten.Now, here comes the knuckle sandwich.Cruz, who is making a strong run in Republican presidential primary polling, has done everything he can to put off an inevitable showdown with frontrunner Donald Trump. The reluctance is understandable – Trump’s attacks on other candidates in the race have been devastatingly effective. To avoid them, Cruz has...