Michael Minogue holds a commanding lead in the Massachusetts Republican primary for governor, set for September 1, after securing roughly 70 percent of delegate support at the state convention and earning an endorsement from eliminated candidate Mike Kennealy. His substantial self-funding and campaign resources have enabled extensive advertising and organization that outpace Brian Shortsleeve, the sole remaining opponent on the ballot. Recent polling shows Minogue ahead by wide margins among likely Republican primary voters. Late developments such as unusually low turnout or an unforeseen scandal could still shift results before election day, though the current structure of endorsements, fundraising, and voter surveys points to limited openings for a challenge.