Robert Charles leads trader consensus at 52% implied probability in the Maine Republican gubernatorial primary due to his sustained polling dominance, including a March Maine Wire survey showing him at 51% pre-debate among likely GOP voters amid a fragmented eight-candidate field, bolstered by former House Speaker Newt Gingrich's endorsement on March 24. Jonathan Bush trails at 21% on strong early fundraising exceeding $1 million and family name recognition, highlighted by his April 15 tax cut proposal for a $1 billion income tax reduction. Lower-tier candidates like Ken Capron, David Jones, and Ben Midgley draw single-digit support from niche appeals in crime, leadership, and business, with Jim Libby's April 9 dropout potentially consolidating votes. The June 9 primary looms as undecided voters and outside spending, including Reclaim Maine's backing for Charles, could shift dynamics.