This short clip is from part of Warren's speaking tour in Andover, Massachusetts. Impressed, Greg Sargent at the Washington Post had this to say about it:

Republicans are planning to paint Warren as a liberal Harvard elitist — they’re already referring to her as “Professor Warren” — because they believe that she will have trouble winning over the kind of blue collar whites from places like South Boston that helped power Scott Brown’s upset victory. But as this video shows, Warren is very good at making the case for progressive economics in simple, down-to-earth terms. Despite her professorial background, she sounds like she’s telling a story. She came across as unapologetic and authorative, without a hint of the sort of defensiveness you hear so often from other Democrats when they talk about issues involving taxation and economic fairness. This is exactly what national Dems like about Warren.

Transcript via rumproast.

I hear all this, you know, “Well, this is class warfare, this is whatever.”—No! There is nobody in this country who got rich on his own. Nobody. 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, and hire someone to protect against this, because of the work the rest of us did. Now look, you built a factory and it turned into something terrific, or a great idea—God bless. Keep a big hunk of it. But part of the underlying social contract is you take a hunk of that and pay forward for the next kid who comes along.

Little wonder then that Scott Brown doesn't want to talk about the polls in Massachusetts which now show Warren with a slight lead.