Rachel Maddow has taken to YouTube to give a sneak preview of her new book, "Drift: The Unmooring Of American Military Power." The title, as Maddow acknowledged in the video, is rather wonkish. But, as she explained, the subject is a simple one. She said she wanted to explore "why it is that in my adult life we have been at war so much of the time." In 2012, she continued, "We don't even really think of ourselves as being at war anymore.