Michael Minogue maintains a commanding lead in the Massachusetts Republican gubernatorial primary due to securing roughly 70 percent delegate support and the official MassGOP endorsement at the April 2026 state convention, which granted ballot access and prompted Mike Kennealy’s withdrawal and endorsement. A recent UNH poll showed Minogue ahead 46-15 among likely primary voters, while Brian Shortsleeve qualified narrowly at the convention but faces pressure from party figures to consolidate behind Minogue ahead of the September 1 primary. Traders price in limited upside for Shortsleeve or Kennealy absent major late developments such as unexpected endorsements, polling reversals, or debate outcomes that shift turnout in the low-turnout Republican primary.