Brown, Warren Trade Charges Of Third-Party Involvement

Republican U.S. Sen. Scott Brown and his Democratic challenger, Elizabeth Warren, traded barbs Saturday over allegations that they both illegally worked with outside political groups.

The Massachusetts Democratic Party has filed a complaint with the Federal Election Commission claiming Brown and Karl Rove collaborated on a series of anti-Warren automated phone calls paid for by Rove's political action committee, Crossroads GPS.

"If Karl Rove and Scott Brown have been working together, it ought to come out," Warren said. "It ought to be known publicly."

At the same time, the Massachusetts Republican Party claims the Warren campaign illegally collaborated with the AFL-CIO on mailings that attacked Brown.

"I think that's very serious and it needs to be looked into immediately," Brown said.

Both deny illegally working with outside groups. Earlier this year, Brown and Warren each signed what they called the "People's Pledge" to keep third-party attack ads out of the race.