Republican presidential candidate Ron Paul on Tuesday declared that Democratic Massachusetts Senate candidate Elizabeth Warren was a "socialist."

At a campaign event earlier this year, Warren told supporters that there is "nobody in this country who got rich on his own."

"You built a factory out there -- good for you. But I want to be clear. You moved your goods to market on the roads the rest of us paid for. You hired workers the rest of us paid to educate. You were safe in your factory because of police forces and fire forces that the rest of us paid for. You didn't have to worry that maurauding bands would come and seize everything at your factory," she said.

ABC News's Terry Moran asked Paul why Warren was wrong.

"Because she's a socialist," Paul replied. "She wants the government to do all this."

"Educating children is socialism?" Moran wondered.

"That is a socialist idea, that it should be collective," Paul explained. "I preach home schooling, and private schooling and competition in schools. But what she forgets -- she's right. You know, by the use of force, the government comes with a gun and they take money and they build a highway that, incidentally, you can use because you don't have any other choices."

"So in Ron Paul's ideal America, there would be no public highways, no public education?" Moran pressed. "There'd be no public air traffic control system? There'd be no public protection for workers in coal mines?"

"That's an overstatement because it might be a lot better," Paul said. "I think France has a private air traffic controllers."

It isn't the first time Warren has been called a socialist.

An unemployed supporter of the the tea party lost his cool at a Warren campaign event last week and called her a "socialist whore."

"If you're the intellectual creator of that [Occupy Wall Street movement], you're a socialist whore," he said. "I don’t want anything to do with you."

After the meeting, the candidate told The Huffington Post that she “actually felt sorry for the guy.”

“He’s been out of work now for a year and a half. And bless his heart, I mean, he thought somehow it would help to come here and yell names.”

Watch this video from ABC News's Newsmakers, broadcast Nov. 8, 2011.