This how Texas Gov. Rick Perry talked about immigration prior to his free fall in the polls:
But if you say that we should not educate children who have come into our state for no other reason than they've been brought there by no fault of their own, I don't think you have a heart. We need to be educating these children, because they will become a drag on our society.
Mr. Cain, speaking at a Tea Party-sponsored rally in Tennessee, made some of his most pointed remarks yet on the issue. He said he might use military troops "with real guns and real bullets" to stop intruders. Responding to anyone who might consider his remarks "insensitive," Mr. Cain said the real fault lies with some illegal immigrants. "It's insensitive for them to be killing our citizens, killing our border agents," he said. "That's what's insensitive. And that mess has to stop."
That's in addition to the electrified fence that would kill anyone who would try to cross. Cain later said he was kidding—at least about the electrified wall of death part.
To reiterate: To talk like a GOP front-runner, DO "joke" about killing undocumented immigrants in your stump speeches. DO NOT suggest they should be treated with compassion, particularly when they had no choice in coming here in the first place.