If there was one message that Megyn Kelly sought to impart in the first installment of her new NBC talk show, Megyn Kelly Today, it was this: The old Megyn can’t come to the phone right now. The host — a law school alum whose best-known skill has long been her prosecutorial zeal — served as her own defense attorney throughout the hour, pushing the case that she’s not the person you remember from her years of political coverage.