The senator from Vermont had almost parlayed a win in New Hampshire and a near-tie in Iowa to frontrunner status. And then he reached for petty one-linersIn what was easily her strongest debate performance in recent memory – and arguably her strongest since the campaign began – Hillary Clinton was calm, cool and collected at Thursday night’s debate.Clinton could’ve been understandably on edge, as she was fresh off a resounding loss in New Hampshire on Tuesday and an effective tie in Iowa the week before.