- Julian Zelizer: A month ago, it looked like the GOP was headed for convention chaos
- Now Democrats are enmeshed in a battle of principles that Bernie Sanders warns may be "messy"
- Donald Trump clinches nomination; Hillary Clinton's path to uniting party isn't clear, Zelizer 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)Just when it seemed that the election could not get any crazier, it has.