The first time I interviewed Ezra Klein, the 28-year-old prince of D.C. media, he brought me a sandwich: prosciutto on a poppy-seed baguette. (Also, chips and a beverage.) We were in the back of a chauffeured black town car, sent by the Washington Speakers Bureau, to take Klein from his office at The Washington Post, across the river, to a speaking event at the Northern Virginia Community College. There, he would give a talk on U.S. politics. “I have a little spiel I do at these,” he told me. “The one I like to do is called ‘Why Washington is Horrible (in Charts),’ but they don’t have PowerPoint capability, so I’m doing a modified version.”The