Shake up for Republicans as Ben Carson Takes Lead in Iowa Polls

Donald Trump experiences his worst day in the race as some polls no longer show him as the frontrunner.
1:44 | 10/23/15

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Transcript for Shake up for Republicans as Ben Carson Takes Lead in Iowa Polls
And now to the race for 2016. We've heard Donald Trump point so often to his lead in the polls. Now his competitors gaining ground. Tom llamas is in Kansas tonight with Ben Carson. I ¿ Reporter: Donald Trump is never shy. Especially about his poll Numbers. I'm number one in every poll. Trump on top. Your Numbers are unbelievable. Boom boom boom. Really amazing number. Somebody said you love polls. That's only because I'm winning every single one of them. Right? Right? Reporter: Not anymore. Tonight, in Iowa, trump now losing to Dr. Ben Carson, who's drawn attention with his provocative statements. I would not advocate that we put a Muslim in charge of this nation. I absolutely would not agree with that. Reporter: Carson's comments seem to help him. Particularly with key evangelical voters trump is trying to win. I'm a good Christian, okay? Remember that. Reporter: Praying with pastors at trump tower. So today we pray for Donald Trump. Yes. Reporter: And you won't hear "Happy holidays" from trump. If I become president, we'll be saying merry Christmas at every store. I'm saying merry Christmas to whoever the hell wants to hear it. Reporter: So today I asked Carson, why is he doing so well? I don't change my message from one group to another group. And I think everyone can observe that. Reporter: Carson tells me his success comes straight from god. And David, tonight, new signs of trouble for an early favorite who's been struggling. We've learned that Jeb bush's campaign is slashing payroll by 40%. Saying they never predicted the national front runner would be a television star.

This transcript has been automatically generated and may not be 100% accurate.

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