John Dickerson on his new book, "Whistlestop"

Has American politics always been as brutal as it is today? And what lessons from past presidential campaigns can help us make better sense of the chaotic 2016 race?

Face the Nation moderator John Dickerson examines these questions and more in his new book, "Whistlestop: My Favorite Stories from Presidential Campaign History". Dickerson spoke with CBS News correspondent Dan Raviv on Friday about his book, the 2016 campaign, and more. Click here to listen to the Podcast of their interview.