Jeb Bush made headlines Friday when he used wit to parry the boos of college-age conservatives at a conference outside Washington, D.C. “For those who made an ‘ooo’ sound — is that what it was? — I’m marking you down as neutral and I want to be your second choice,” he told the crowd, in what sounded like a prepared line. But the moment may not have been the most consequential conservative test he passed last week.