Book excerpt: What happens when an angry radical finds himself (more) penniless (than usual) after one too many protests? Why, he becomes a dogwalker, picking up the poop of Washington D.C.'s canine elite. It sounds like the setup to a joke, but it's also the absolutely true story of Joshua Stephens, a committed anarchist who spent ten years as a professional dogwalker to D.C.'s and New York's financial and political establishment.