In her keynote address on Friday to the Netroots Nation 2012 conference in Providence, Rhode Island, Massachusetts Democratic candidate for Senate Elizabeth Warren enlarged upon her themes of economic fairness and took aim not just at the Republican she's running against, Senator Scott Brown (R-MA), but the Republican candidate for president, former Massachusetts Governor Mitt Romney (R).

"No, Mitt, corporations are not people," she said. "People have hearts, they have kids, they get jobs, they get sick, they love, they cry, they dance, they live and they die. Learn the difference."

She was referring to a statement made by Romney early in the primary campaign. Last August, at the Iowa State Fair, in response to a question about the infamous "Citizens United" ruling by the Supreme Court, Romney said, "Corporations are people, my friend."

The Washington Post's Election 2012 blog reported that Warren's voice was hoarse but strong, not from last week's Massachusetts Democratic Convention, she said, but "from the parties." The candidate seemed undaunted by right-wing digs at her heritage, saying, "Let me be clear, I am not backing down."

Watch the speech, embedded via Netroots Nation 2012, below:

(image via YouTube screen capture)