It was the stuff national headlines are supposed to be built on: A hyperlocal outlet like the Leader does the leg work, regional papers verify and amplify the story, and before long an emerging political scandal is being broadcast coast-to-coast. But that system, which has atrophied for decades amid the destruction of news economies, appears to have failed completely this time. Despite a well-heeled and well-connected readership — the Leader’s publisher says it counts among its subscribers Fox News hosts Sean Hannity and Jesse Watters and several senior people at Newsday, a once-mighty Long Island-based tabloid that has won 19 Pulitzers — no one followed its story before Election Day.