- Trump is clear front-runner and Rubio is the clear alternative, a candidate who has real strengths, writes Julian Zelizer
- Rubio has Ronald Reagan's ability to appear moderate while backing strong right-wing agenda, 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)The big news coming out of South Carolina was obviously Donald Trump's decisive 10-point victory. No longer the maverick, no longer the insurgent, no longer the question mark -- Trump is now the clear front-runner in the race for the Republican nomination.