Pelley: GOP race may be far from over

If the latest polling is to be believed, Mitt Romney is poised to solidly win Florida's Republican primary Tuesday, but that won't mean the race for the GOP presidential nomination is anywhere near finished.

"You can't say that it's over until it's over," Scott Pelley said on "CBS This Morning," noting that new rules in many primary states call for a proportional division of delegates. That means even losing candidates can still rack up delegates as they head toward the party's nominating convention in August.

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Former House Speaker Newt Gingrich has slumped in the polls in Florida after a decisive win in South Carolina and could very well struggle in the coming weeks. Four of the next five contests are caucuses - Nevada, Maine, Colorado and Minnesota - that traditionally require more ground-level organization to be successful, something the Gingrich campaign lacks. And in the fifth, Missouri, Gingrich isn't even on the ballot.

But if Gingrich can get to Super Tuesday on March 6, he "could hold on for a long time," Pelley said.

Scott Pelley is the anchor and managing editor of the "CBS Evening News" and a correspondent for "60 Minutes." For more of his analysis of the Florida primary and the Republican race at large, click on the video player above.