Michael Minogue holds a commanding lead in the Massachusetts Republican primary for governor, driven by his decisive 70% victory at the state party convention in April 2026, which secured the official endorsement and prompted eliminated candidate Mike Kennealy to endorse him. Polling among likely primary voters consistently shows Minogue ahead by wide margins, supported by his substantial self-funding from a successful career as CEO of Abiomed and his military and business background. Brian Shortsleeve, the remaining opponent and former MBTA executive, trails significantly despite efforts to highlight policy differences on affordability and spending. With the September 1 primary just days away, trader consensus reflects this consolidation of support; late shifts among undecided voters or unusually low turnout could narrow the gap, though no major recent developments have altered the trajectory.