- Republican and Democratic primaries take place in key states of Florida and Ohio on Tuesday
- Julian Zelizer: Likely front-runner for each party should become much clearer by time polls close
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)This Tuesday is poised to be the most significant night since Super Tuesday on March 1 in shaping the dynamics of the presidential race for both parties.