For Chris Christie, the gymnasium will be a familiar setting. Livingston High School is where he watched classmates play basketball and cheer the football team before big games, cheering on the powerhouse Lancers. He rose over his contemporaries—including the man who now serves as President Obama’s top economic adviser, as well as a former baseball teammate whose role in closing a bridge into New York City would dog Christie’s political future—to become a three-time student body president. On these polished hardwood floors, trimmed in green paint, the New Jersey Governor will try to return to the rosier times, when ahead of him lay years as the Big Man on Campus at Delaware and then a high-profile posting as a young U.S.