- Hillary Clinton and Donald Trump are their parties' presumptive nominees
- As primary season winds down, Julian Zelizer looks at what it has taught us about their strengths and weaknesses
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)Hillary Clinton vs. Donald Trump.