N.J. Stat. § 2A:158-21
No county prosecutor, assistant prosecutor or legal assistant to a prosecutor, while holding any such office or position, shall (1) be a candidate for election to, or hold, any elective public office or any office or position with any political party or club, or (2) in connection with the candidacy of any person for public office, sign or authorize the use of his name in connection with political or campaign literature or material, or print or publish in order to distribute such political or campaign literature or material; provided, however, that the prohibition against holding office contained in this act shall not prevent any individual, holding or filling any such office as of the effective date of this act, from completing any term of office for which he has heretofore been elected or chosen; and provided further that nothing herein contained shall be construed to prohibit any such prosecutor, assistant prosecutor or legal assistant from being a candidate for election to, or from holding, the office or position of delegate or alternate to the national convention of any political party.
N.J.S. § 2A:158-21