With very few exceptions, all elections in Massachusetts could use RCV. We are in favor of using RCV for all elected offices in the Commonwealth, from local offices like mayor and city councilor, to state legislative seats, county offices like district attorney and sheriff, statewide seats like governor, and federal congressional and senate seats. Ideally, it would be used to choose which presidential candidate receives the state's electoral votes, as well.
The only existing elections to which RCV could not apply would be presidential primaries. In Massachusetts, each party allocates its convention delegates proportionally to the presidential primary contenders, so there's no need for RCV to find a winner within the state. Also, should the National Popular Vote interstate compact take effect, using RCV to choose our individual state's electors would no longer make sense, as the president would be chosen by the popular vote in all 50 states and the District of Columbia. However, if we were to have a national popular vote for president, we favor that vote use RCV nationwide.