Former Massachusetts Senator Scott Brown speaks at the Republican Leadership Conference on Friday. Democratic Sen. Jeanne Shaheen wants Brown to continue
Former Massachusetts Senator Scott Brown speaks at the Republican Leadership Conference on Friday. Democratic Sen. Jeanne Shaheen wants Brown to continue his pledge to limit outside money. (AP Photo/Jim Cole) (Jim Cole)

NASHUA, N.H. (AP) -- Democratic U.S. Sen. Jeanne Shaheen is calling on newly announced Republican challenger Scott Brown to sign the same pact in New Hampshire that helped prevent outside groups from pouring millions of dollars into his last Massachusetts Senate election.

In a letter sent Saturday, less than 24 hours after the former U.S. senator from Massachusetts entered the race, Shaheen said she "very much admired the People's Pledge" that Brown signed with Sen. Elizabeth Warren in 2012. Brown lost his Senate seat to Warren.

"I believe it limited the influence of outside groups and allowed the people's voices to be heard," Shaheen wrote. She asked Brown to make a similar pledge this year to give New Hampshire voters "the assurance that their voices will not be drowned out by third-party expenditures."

The challenge comes as national outside groups gear up to send a river of money into a New Hampshire Senate contest that could be the most expensive in state history.

Brown on Friday night formally launched an exploratory committee to enter the Senate campaign during a Republican conference in Nashua, ending months of speculation about his intentions. While Brown has yet to file formal candidacy papers, his decision all but assures the GOP will have a top-tier contender in a November election that Shaheen was once expected to win easily.

The Washington-based Republican ally American Crossroads immediately announced plans to invest $650,000 in a television advertising campaign against Shaheen beginning next week.


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And even before Brown joined the race, outside groups on both sides spent more than $1 million in recent months on television advertising to influence the New Hampshire Senate contest.

Brown was asked Friday night, before Shaheen issued her challenge, whether he would agree to a pledge. "We'll talk about the political stuff later," he responded.

Brown didn't immediately respond to Shaheen's request.

But a Brown adviser notes that the move comes as Shaheen is on a multiple-city West Coast fundraising swing that includes high-dollar receptions to benefit groups that help elect female Democrats to the Senate.

Brown was to meet with voters in New Hampshire's North Country on Saturday.

The deal would require both candidates to donate half the cost of any outside group advertising campaign to a charity of the opposing candidate's choosing. The deal was credited with preventing the crush of negative advertising in the 2012 Massachusetts race that flooded airwaves in races in other states.

Shaheen included a signed copy of the pledge in her letter to Brown and asked him to sign and return it as soon as possible.