The game has changed, and it's time to throw out the old playbook. So asserts Chris Hayes, host of  MSNBC's "All In with Chris Hayes," in his latest book, The Sirens' Call: How Attention Became the World's Most Endangered Resource. He and Henry sat down on Wednesday to discuss the most fought-after commodity of the Digital Age: attention. They explore how our sleek modern tools have altered the way campaigns are executed, and why the political winners of this century will be those who can wield the gadgets of the future while possessing the ancient charisma that moves the people.