Romney, drawing himself up to full height, said, "Mayor, you know better than that… I think it is really kind of offensive actually to suggest, to say look, you know what, if you are a homeowner and you hire a company to come provide a service at your home—paint the home, put on the roof—if you hear someone… with a funny accent, you, as a homeowner, are supposed to go out there and say, "I want to see your papers.""

Romney's position is a reasonable one, though he was lying when he claimed illegal immigrants did not work on the Governor's mansion. They did. Illegal Guatemalans tended the lawn there.

The fight between Romney and Giuliani went on. At some point one of the other candidates, off camera, said "Let us jump in here." Romney accused Giuliani of "pursuing a sanctuary nation," which is clearly false in light of Giuliani's newly invigorated hatred of illegal immigration. Giuliani tried to defend himself but the spat had gone on too long. The crowd began to boo.

Fred Thompson was given a chance to speak and looked excellent merely by looking calm and parroting Republican talking points. He called legal immigrants "some of our better citizens." He said, "We've got to strengthen the border. We've got to enforce the border. We've got to punish employers who will not obey the law. And we've got to eliminate sanctuary cities." It came as a relief at the Giuliani-Romney slugfest.

John McCain followed Thompson, looking disgusted with his rivals. "You know, this whole debate saddens me a little bit," he said. McCain doesn't do well in the debate format—he acts frequently as though the sniping and the soundbite messaging is below him. His frustration shows in his body language. It did here. But perhaps that was only because immigration is an issue on which McCain has taken a beating recently. He looked chastened for his previous support of bipartisan immigration reform bill and acknowledged at the debate that you've got to "secure the borders first."

But the side of McCain that urged him to take the lead in a compromise plan that offered a pathway to citizenship to illegal immigrants eventually came out. McCain closed his comments by saying, "We need to sit down as Americans and recognize these are God's children as well. And they need some protection under the law. And they need some of our love and compassion."

McCain was followed by Tom Tancredo, who is running a campaign almost exclusively on his hardline opposition to illegal immigration. Asked about Romney and Giuliani fighting over who has the stronger anti-illegal credentials, the Colorado congressman was gleeful. "All I've heard is people trying to out-Tancredo Tancredo," he said. "It is great."

Asked a question about small businesses who want the sort of low-wage immigrant workers that would be available as guest workers under the McCain Senate bill, Tancredo was dismissive, saying, "I'm not going to aid any more immigration into this country."

Duncan Hunter, a congressman from the San Diego area, spoke next. As someone who has taken the lead on Congress' efforts to stop illegal immigration, Hunter could speak on substance. The double border fence he built south of his district "reduced the smuggling of people and drugs by more than 90 percent and the crime rate in the city of San Diego went down by 53 percent," he said. Rudy Giuliani's empty attacks on "sanctuary mansions" weren't necessary.

The newly ascendant Mike Huckabee spoke last. He repeatedly defended his decision as governor of Arkansas to give college scholarship opportunities to the children of illegal immigrants. He took a compassionate tack. "We're not going to punish a child because the parent committed a crime. That's not what we typically do in this country." Later he said, "We're a better country than that."

When Romney oversimplified Huckabee's scholarship program—which demands that a student meet certain academic standards, be drug free, stay out of trouble, and be applying for citizenship—Huckabee said, "I know how hard it was to get that degree. I am standing here tonight on this stage because I got an education. If I hadn't had the education, I wouldn't be standing on this stage. I might be picking lettuce."

As a Governor, Huckabee didn't need to take a position on the now-defeated comprehensive immigration reform bill pushed by McCain, Ted Kennedy, and George W. Bush. Aside from the scholarships and a couple of occasions in which Huckabee was literally nice to immigrants, little is known of his position on the issue. But one line from the debate might offer a clue. His scholarship plan "accomplished two things that we knew we wanted to do," Huckabee said. The first: "Bring people from illegal status to legal status."

Update: Romney and Giuliani have a history of fighting over this stuff.