N.H. Rev. Stat. § 664:12
As part of the declaration of candidacies filed by candidates for governor, councilor, state senator, state representative, and county officer , every such candidate shall designate some individual, who may be the individual candidate , as the treasurer for the purpose of the primary and general election campaign. If candidacy for such office is established by a primary petition or nomination petitions, there shall be filed together with such petitions the name of the treasurer for such candidate. A candidate who is nominated by write-in vote at the primary shall, prior to making any campaign expenditures, file with the secretary of state the name of the treasurer. The treasurer shall approve all sums expended or contracted for payment in the election cycle and join with the candidate in making and filing the statements required by this chapter.
RSA 664:12
1979, 436:1. 1987, 276:3, eff. July 24, 1987.