New ad paints Warren as hard-nosed fighter

"She told all the Wall Street banks to clean up their act," says one woman in the ad.

"Big banks, institutions, Wall Street — she’s not afraid of anybody," says another.

The ad doesn't mention Brown or the fact that Warren is a Democrat.

Warren's new ad comes as new developments continue to emerge in the controversy over her claim to Native American heritage, which her opponent, Sen. Scott Brown (R-Mass.), has continually questioned.

The New England Historic Genealogical Society on Tuesday said there was no evidence that Warren had Native American ancestors. And a 1997 story from the Fordham Law Review, spotted by Politico, showed that Harvard Law touted Warren as the faculty's "first woman of color."

- This post was updated at 12:04 p.m.