Big Brother Watching Travelers at U.S. Airports?; Chaos Reigns as New Mexican President Takes Power; Senator Barack Obama Speaks Out on AIDS Crisis - Part 2.

(From CNN News)

KUSHNER: Well -- well, first of all, Paula, he's talking about American citizens. And, out of 400 million people a year, not all of them are American citizens. The far majority are foreigners, and foreign nationals. And, look, if it is abused, and if people are hurt by this, eventually, it will come out. And then there is access in the courts... ZAHN: But how will we know, because we are not going to have access to that information? We won't know what our risk assessment is.

(CROSSTALK)

KUSHNER: Paula, we live in a dangerous world. We have to take precautions. This is necessary. If I thought, in any way, that the government was doing this purposefully to hurt people, I would be against it, just as David is.

But this is being done to protect the general public flying and protect the United States of America and our security.

ZAHN: Gentlemen, we have got to leave it there.

David Sobel, Dr. Harvey Kushner, thank you for your -- both of your points of view.

(CROSSTALK)

ZAHN: Next, we are going to head south for tonight's "Top Story" along the border, where one man has been fighting his own battle to stop illegal immigration, until he pulled a gun on some U.S. citizens. See what happened to him.

And, then, a little bit later on, a "Top Story" in religion and politics: what Senator Barack Obama had to say about AIDS at a conference of evangelicals today.

We're also going meet a man you probably won't recognize. But he's definitely someone you should know. Before he started his new job today, people were pushing and shoving and getting into fights about it. We will explain when we come back. Please stay tuned.

(COMMERCIAL BREAK)

ZAHN: Right now, tonight's "Top Story" in the fight over illegal immigration.

Immigration reform went nowhere in Washington this year, but, along the U.S. border with Mexico, the anger over the problem is constantly on the verge of breaking. Just take a look at what happened when an Arizona rancher, trying to protect his own property, ran into a Latino family on a hunting trip.

Ed Lavandera has his story.

(BEGIN VIDEOTAPE)

RON MORALES, RESIDENT OF ARIZONA: ... has a big D on it.

ED LAVANDERA, CNN CORRESPONDENT (voice-over): Ron Morales says he just wanted to take his girls mule deer hunting in the Arizona scrub brush, just as his father had taken him.

VENESE MORALES, DAUGHTER OF RON MORALES: We just headed out and were having a really good time with my family and my friends.

LAVANDERA: But the Morales family outing ran headlong into the national immigration debate, when they were confronted by a local rancher doing some hunting of his own.

R. MORALES: Man, I mean, he was just cussing up a storm and screaming at the top of his lungs, that, my dad is just like his f'ing Mexican -- ignorant brothers from -- from Mexico. You're all the same, he said.

V. MORALES: We're not getting out of here alive. We're just going to die right there.

UNIDENTIFIED MALE: This it Barnett ranch all throughout here. LAVANDERA: Roger Barnett was on a self-appointed patrol, packing an assault rifle and a conviction that U.S. citizens need to take the problem of illegal immigration into their own hands.

R. MORALES: As soon as I asked him what his name was, that's when he went back to his truck, and reached underneath the -- his seat,…