Nina Easton, Fortune's Washington bureau chief and a Fox News regular, helped out Mitt Romney on his new book that hits shelves today, "No Apology: The Case for American Greatness." That's according to the book's acknowledgements, where Romney writes she "advised me on ways to make the message of what I had written more clear and compelling." Should a political analyst and journalist be helping out a former (and future?) presidential candidate with his book? Boston Globe correspondent Sasha Issenberg reached out to Easton and looked at whether there's any conflict given her role as political analyst, along with the...