In this Part II of this subtitle the following words have the meanings indicated. “Incumbent” means a member of the General Assembly. “Publication expense” means an expenditure relating to writing, publishing, printing, issuing, mailing, or distributing an unofficial legislative newsletter. “Unofficial legislative newsletter” means an unsolicited document used by an incumbent, without supervision by or coordination with the General Assembly, to disseminate information to a constituent, voter, or potential voter about: the incumbent’s performance in legislative office; or one or more issues of public interest chosen by the incumbent.