At the center of the stage, and the center of the debate's hottest exchanges, was a 38-year-old man who no one expected to be there even a few months ago – a novice candidate and technology entrepreneur named Vivek Ramaswamy. Though he’s well behind Trump, Ramaswamy has crept up in recent polls, leading to his position next to Florida Gov. Ron DeSantis at center stage. And he quickly showed why when he showcased his ready-for-video, on-message approach, talking about how his poor parents moved to the U.S. and he had the ability to found billion-dollar companies. Mp> Then Ramaswamy tried...