This week Wendy Butler talks with Michael Warr , Poetry Editor for the book " Of Poetry & Protest: From Emmett Till to Trayvon Martin " (W.W. Norton & Company). Warr is also an award-winning poet and Deputy Director of San Francisco's Museum of the African Diaspora. "This book is as much a call to action as it is a call to embrace the relevance and humanity of its creative content," he writes in his essay at the start of this book.