E.J. Dionne: A pivotal week for Biden and Sanders

Washington • This week’s two-day Democratic debate-fest is so sprawling that it looks more like a New England town meeting than a confrontation among presidential candidates. But don’t count on its being neighborly.First, advice to everyone: Figure out who you are. This makes it easier to answer surprise questions and explains why both Sen. Elizabeth Warren and Mayor Pete Buttigieg have had such a good start. They don’t have to calculate on the fly. This helped Sen. Bernie