NEW HAMPSHIRE – A GOP source familiar with his plans confirmed to The Hill that Brown is  launching the committee. The  Associated Press first reported the news via Twitter, and said the committee  news could come as “early as tomorrow.”
Brown is seen by Republicans as the strongest possible candidate against  Shaheen, whom they believe to be vulnerable because of frustration with  ObamaCare in New Hampshire.
He moved to New Hampshire late last year and has been campaigning and  fundraising for local GOP candidates and the state party for the past six months  or so — all steps that only fueled speculation over his plans.
Brown had made no secret of his interest, and it was in fact intense — and,  for Democrats, worrisome — enough that it inspired Democratic outside groups to  launch preemptive attack ads on him in the state.
Those ads appeared to have had an impact on his support, widening Shaheen’s  lead from three points in a January survey from Democratic firm Public Policy  Polling to eight points in a February poll from the same firm.
Another poll, out early this month from Suffolk University and the Boston  Herald, showed Shaheen up by 13 points.
Still, Brown recently said the attacks were making him more eager to run.
Multiple sources tell The Hill that Brown and his affiliates have been making  calls over the past two weeks to GOP operatives in New Hampshire or with Granite  State ties looking to assemble a campaign team.
“They said they were looking for any people looking for field work and anyone  for a campaign team to be assembled ASAP,” one Republican source told The Hill  of a conversation they had two weeks ago with a member of Brown’s team.  (read more)