Huckabee was asked to respond to a former Bush aide's remark that the candidate's emphasis on religion had made him queasy. "I don't try to impose it on other people," the candidate said, "and I certainly would never use the auspices of government to try to push my faith."
"I didn't disagree with [Norris] at the time because I was standing next to him," Huckabee said.
But McCain's age is not an issue, Huckabee said.
McCain parried by noting his own recent endorsement from Sylvester Stallone.
On the question of campaign money, Romney refused to reveal how much of his personal fortune he had spent on the race; his most recent public finance report showed it was more than $17 million at the end of September.
Huckabee joked that Romney ought to save his wealth for his five sons.
"You said you wanted them to inherit a great country, and I have a solution, Mitt, that I think will work: If the country will elect me president, they'll inherit a great country, and your boys will still get your money too," Huckabee said.
Romney said he had raised more money from donors than any Republican opponent, but portrayed his own spending on the race as a virtue.
"People can count on the fact that there's nobody that can call me and say, 'Hey, look, you owe me,' because they don't," he said.