GENERAL LAWS OF MASSACHUSETTS
CHAPTER 54. ELECTIONS
Chapter 54: Section 139 Senatorial vacancies
Section 139. Upon failure to choose a senator in congress or upon a vacancy in said office, the vacancy shall be filled for the unexpired term of the following biennial state election provided said vacancy occurs not less than seventy days prior to the date of the primaries for nominating candidates to be voted for at such election, otherwise at the biennial state election next following. Pending such election the governor shall make a temporary appointment to fill the vacancy, and the person so appointed shall serve until the election and qualification of the person duly elected to fill such vacancy.