A meeting between top campaign staffers for Republican U.S. Sen. Scott Brown and chief Democratic rival Elizabeth Warren has ended without a deal to curb political attack ads by outside groups.
Both candidates say they want an enforceable deal with financial penalties if a third-party group runs an ad designed to help their campaign or hurt their opponent.
Brown has suggested each candidate should donate half the cost of third-party ads to a charity of their choice and that the campaigns send joint letters to outside groups and broadcast outlets urging they avoid airing the ads.
On Friday, Warren's campaign released a statement saying Brown's proposal has "loopholes that Karl Rove could drive a tank through" but that she remains confident a "strong, enforceable agreement" can be reached.
Brown's campaign said Warren has "offered nothing but talk and excuses."
There have been ads from outside groups attacking both Brown and Warren.
This article was originally published on January 20, 2012.
This program aired on January 20, 2012. The audio for this program is not available.