The late politician John McCain was a senator, war veteran, and GOP presidential candidate; but he will likely be remembered best as a man who brought character and a rare moral center to politics, at a time when both are severely lacking. The new book 'The Luckiest Man: Life with John McCain' is a deeply personal and honest remembrance of the late senator, written by one of his closest friends and advisors, Mark Salter. Mr. Salter joins us to tell us about the book, and his late friend and confidant.