Michael Minogue maintains a dominant lead in the Republican primary for Massachusetts governor due to his overwhelming 70% delegate support at the state party convention in April, heavy self-funding exceeding $15 million that enabled early advertising, and consistent polling advantages of roughly 40 points or more among likely primary voters. Former candidate Mike Kennealy, eliminated at the convention, endorsed Minogue in June, consolidating support while Brian Shortsleeve trails with limited resources and a more moderate positioning. The primary occurs September 1. A sudden shift remains possible only through unforeseen events such as major candidate withdrawals, late scandals, or dramatically higher turnout among undecided voters favoring the underdog.