Could Ted Cruz Defeat Donald Trump With Evangelical Voters?

The two Republican presidential candidates battle it out for conservative votes in Iowa.
1:43 | 01/19/16

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Transcript for Could Ted Cruz Defeat Donald Trump With Evangelical Voters?
Jon Karl will talk more about it. It cannot be more engaged. Trump unloaded on Cruz. Cruz doing the same thing to trump but what about this factor now, these talk show hosts like rush Limbaugh weighing in. Reporter: We may have reached a pivotal point where those influential sizes on talk radio are starting to turn on Donald Trump. Until now these have been some of trump's most reliable cheerleaders but in the latest fight they are siding with Ted Cruz, not just rush Limbaugh, mark Levine yesterday said trump should cut the crap with his attacks on Cruz so that New York values attack from Cruz drove people right back to what trump himself said 20 years ago as you know he said he was pro-abortion rights, open to gay marriage because he is from New York, not from Iowa, this is the attack that could really hurt 2ru6r7. Evangelical voters could make all the difference in Iowa. You saw that direct pitch yesterday at liberty university from trump. Reporter: Yeah, now, evangelicals have never been the core constituency for trump. He said he never asks god for forgiveness. Yesterday at liberty, he did something we hear from on the trail a lot, lumping together his book, "The art of the deal" with the bible. Listen to this. I always say, a deep, deep second to the bible, the bible is the best, the bible, the bible blows it away. There's nothing like the bible but "The art of the deal" was the best-selling business book and Obama didn't read it. Reporter: Cruz is on the rise largely because he is winning among evangelicals, although, George, I have to say if you look at national polls, the most recent still has trump with a big lead among evangelicals nationwide. Okay, Jon Karl, thanks very much.

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

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