Gingrich lost, but he hasn’t retired. After 69 years, Newt Gingrich is wealthy, a celebrity, and the owner of a tony home in Northern Virginia. His place in the history books, as the leader of the Republican revolution, has long been established. But the former House speaker isn’t ready to fade away. “I don’t rule it out,” he said on Thursday over breakfast, when asked about a future presidential run. He spoke excitedly about his company, Gingrich Productions, and his upcoming trip to South Carolina, where he won the Republican primary last year. Gingrich’s unflagging energy isn’t surprising. We’ve all...