Fifteen minutes went by without Chris Christie getting a word edgewise. “I’m usually not somebody that gets missed,” he quipped when the moderators finally turned their attention to him. And then it was off to the races as the ex-Jersey governor turned up the heat and grabbed attention, at one point calling Vivek Ramaswamy “the most obnoxious blowhard in America.” In the latest edition of NJ Advance Media’s “What Makes Christie Run?” newsletter, political reporter Matt Arco breaks down Wednesday night’s fourth Republican presidential debate — and Christie’s performance. Arco, who was on the ro…