From the time of the Puritans until now, there has never been a true separation of church and state. That's what historian Andrew Preston found after examining the diplomatic record of successive American governments. He lays out the evidence in his book "Sword of the Spirit, Shield of Faith: Religion in American War and Diplomacy". The book is nominated for the Charles Taylor Prize for Literary Non-Fiction. Carol interviewed Andrew Preston last week before we learned that he won this 2013 prize!