Mitt Romney landed here Sunday with a simple message: Newt Gingrich is a failure and a fraud. And a disgrace. And a hapless showman. Standing under a brilliant orange Florida sunset, Romney delivered his longest sustained critique of the South Carolina primary winner to date – ticking through a list as if he were reading off Gingrich’s Wikipedia page, and undercutting each item as he got to it. “Speaker Gingrich has also been a leader,” the former Massachusetts governor said. “He was a leader for four years as speaker of the House. And at the end of four years, it...