Three days after a trifecta of losses underlined lingering questions about his ability to win over the Republican Party’s base, Mitt Romney arrived at CPAC to allay skeptics’fears. Throughout his second bid for the GOP nomination, Romney has made his business bona fides the centerpiece of his candidacy. But on Friday, before a packed room at the annual conservative confab, he sought to emphasize the record he compiled in Massachusetts. “I was a severely conservative governor,” he told the crowd. “I know conservatism, because I have lived conservatism.”