- Julian Zelizer: Presidential candidates weigh responses to Orlando shooting to show they are best on national security
- He says throughout history, how candidates have used crises has allowed voters to ponder how they'd lead under threat
- Zelizer: Trump and Clinton social media reactions open them up to criticism from the other
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)As law enforcement officials sort through the rubble at Pulse nightclub in Orlando, and learn more about how America's deadliest mass shooting unfolded, the presidential candidates will be posturing to ensure that they use this moment wisely.