Me. Rev. Stat. tit. 30-A, § 2504

No municipality may enact any charter provision or ordinance prohibiting the circulation of petitions for any local initiative. A petition related to any local initiative, including, without limitation, petitions filed under section 2522, section 2528, subsection 5, the Constitution of Maine, Article IV, Part Third, Section 21, or a municipal charter provision authorizing local initiatives, may be circulated as provided in Title 21‑A, section 903‑A.