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Republican National Committee Chairman Reince Priebus says the GOP has a great field of presidential candidates but that there's still time for someone else to get in.

With some conservatives saying Texas Gov. Rick Perry has had a shaky debate performance, speculation about the future of the GOP race has returned to the possibility of more candidates.

There's been talk that New Jersey Gov. Chris Christie could still enter the race, although Christie has said he's not planning to. Former Alaska Gov. Sarah Palin has left open the possibility that she might run.

Priebus says it gets "harder and harder" for other candidates to get in as the caucuses in Iowa early next year get closer, but he says there's still time. He appeared Sunday on CBS' "Face the Nation."

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