**Voter sentiment on Massachusetts Question 3 remains closely balanced ahead of the November 3, 2026 election.** The top-two primary initiative, which would replace partisan primaries with a single all-party ballot advancing the two highest vote-getters regardless of affiliation, cleared its final legal hurdle in June when the Supreme Judicial Court rejected challenges to its constitutionality. Both the Democratic and Republican state parties oppose the measure, citing risks of reduced party influence, higher campaign costs favoring well-funded candidates, and diminished grassroots impact. Support from some moderate Democratic legislators and reform advocates has created a split within the dominant party, while historical precedent from similar systems in California and Washington provides competing examples of outcomes. Traders appear to weigh these institutional headwinds against potential appeal to independent voters and primary reform momentum in a state where most local races already use nonpartisan preliminaries. Key upcoming developments include any late polling shifts or additional endorsements before Election Day.