Former Massachusetts Gov. Mitt Romney has never really stopped running for president since that February day in 2008 when he ended his challenge to Sen. John McCain (Ariz.). While Romney took an extended hiatus to write his book -- "No Apology: The Case for American Greatness" -- he never really left the political game, staying in close touch with a small group of political advisers who have kept the presidential flame lit over the past two plus years. That loyal group has helped Romney emerge as the frontrunner in the Invisible Primary -- the behind-the-scenes battle before the battle for...
