What was behind Mitt Romney’s unwillingness to use Benghazi as an issue in the 2012 presidential race? The recent book, Double Down, by Mark Halperin and John Heilemann, which purports to give the most detailed account of the 2012 campaign to date, attempts to answer that question. Halperin appeared on The O’Reilly Factor on the Fox News Channel earlier this month to discuss the new book.