Massachusetts Constitution Pt. 2, Ch. II, § 3, Art. 7

ART. VII. [And whereas the elections appointed to be made by this constitution, on the [last Wednesday in May annually,] by the two houses of the legislature, may not be completed on that day, the said elections may be adjourned from day to day until the same shall be completed. And the order of elections shall be as follows: [the vacancies in the senate, if any, shall first be filled up;] the governor and lieutenant governor shall then be elected, provided there should be no choice of them by the people: and afterwards the two houses shall proceed to the election of the council.]