- Julian Zelizer: In Thursday night's debate, Bernie Sanders and Hillary Clinton have an opportunity to restore a constructive tone to their competition
- They should return to talking about ideas and policy rather than indulging in negative attacks, he says
Julian Zelizer is a professor of history and public affairs at Princeton University and a New America fellow. He is the author of "Jimmy Carter" and "The Fierce Urgency of Now: Lyndon Johnson, Congress, and the Battle for the Great Society." The opinions expressed in this commentary are his.
(CNN)In Thursday night's Democratic debate in Brooklyn, Bernie Sanders and Hillary Clinton have an opportunity to restore a constructive tone to their competition and bring back the kind of vibrant ideological debate that until recently shaped much of the primary.