Me. Const. art. IV, pt. 3, § 2-A

The Governor has power to disapprove any dollar amount appearing in an appropriation section or allocation section, or both, of an enacted legislative document. Unless the Governor exercises the line-item veto power authorized in this section no later than one day after receiving for signature the enacted legislation, the powers of the Governor as set out in section 2 apply to the entire enacted legislation. For any disapproved dollar amount, the Governor shall replace the dollar amount with one that does not result in an increase in an appropriation or allocation or a decrease in a deappropriation or deallocation. When disapproving a dollar amount pursuant to this section, the Governor may not propose an increase in an appropriation or allocation elsewhere in the legislative document. The Governor shall specify the distinct dollar amounts that are revised, and the part or parts of the legislative document not specifically revised become law. The dollar amounts in an appropriation or allocation that have been disapproved become law as revised by the Governor, unless passed over the Governor's veto by the Legislature as the dollar amounts originally appeared in the enacted bill as presented to the Governor; except that, notwithstanding any other provision of this Constitution for dollar amounts vetoed pursuant to this section, a majority of all the elected members in each House is sufficient to override the veto, and each dollar amount vetoed must be voted on separately to override the veto. Except as provided in this section, the Governor may not disapprove, omit or modify any language allocated to the statutes or appearing in an unallocated section of law.