Maine constitution
Article IV-3: legislative power
Section 18

3. Timing of elections; proclamation by Governor. The Governor shall, by proclamation, order any measure proposed to the Legislature as herein provided, and not enacted by the Legislature without change, referred to the people at an election to be held in November of the year in which the petition is filed. If the Governor fails to order a measure proposed to the Legislature and not enacted without change to be submitted to the people at such an election by proclamation within 10 days after the recess of the Legislature to which the measure was proposed, the Secretary of State shall, by proclamation, order such measure to be submitted to the people at an election as requested, and such order shall be sufficient to enable the people to vote.