"Actually, we prefer the name 'The Church of Jesus Christ of Latter-day Saints,"' he said. "'Mormon' used to be a nickname and I don't use it a lot, but now and then I do because people know what faith I'm referring to, and I talked about 'my faith' a number of times, and I don't imagine anybody is confused about what faith I have."

The authoritative Encyclopedia of Mormonism, published in 1992, does not refer to Jesus and Satan as brothers. It speaks of Jesus as the son of God and of Satan as a fallen angel, which is a Biblical account.

A spokeswoman for the Church of Jesus Christ of Latter-day Saints said Huckabee's question is usually raised by those who wish to smear the Mormon faith rather than clarify doctrine.

"We believe, as other Christians believe and as Paul wrote, that God is the father of all," said the spokeswoman, Kim Farah. "That means that all beings were created by God and are his spirit children. Christ, on the other hand, was the only begotten in the flesh and we worship him as the son of God and the savior of mankind. Satan is the exact opposite of who Christ is and what he stands for."

Romney also defended his first negative ad of the presidential campaign in Iowa, where Huckabee has erased Romney's long-standing lead in the polls. The spot, which began airing Tuesday, highlights Huckabee's support for in-state tuition for the children of illegal immigrants when he was governor of Arkansas, as well as his support for their being eligible for scholarships.

"It's not negative; it's accurate," Romney said. "It's an ad that shows the differences on a very important topic, and actually, if you agree with Mike Huckabee's positions, it's a positive ad for him. If you agree with my position, it's a positive ad for me."

Romney dismissed Huckabee's rise in the polls — saying he's seen similar surges from GOP rivals John McCain, Rudy Giuliani and Fred Thompson — but he said scrutiny will follow his rival's rise to the top tier.

"I think Mike was desperately hoping that we would get through this without people taking a close look at his positions and his record, but his record on immigration, on pardons for criminals, on reducing the penalties for meth lab dealers, on taxing and spending — he increased spending from $6 billion to $16 billion. I think those features in his record will cause those numbers to turn around," Romney said.

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Associated Press Writer Libby Quaid in Washington contributed to this report.