Nirav Shah holds the lead in the Democratic primary for Maine governor due to his strong polling edge and public health background, with a recent survey showing him at 28 percent initially and expanding his advantage under ranked-choice voting. Early voting has begun ahead of the June 9 contest, and the candidates' final debate highlighted shared priorities on taxing out-of-state residents and the wealthy, expanding housing and healthcare access, and responding to federal policy shifts. Troy Jackson draws support from his legislative record as former Senate president, while Hannah Pingree benefits from her executive experience and family political ties. The market reflects trader assessments of these factors in a closely contested field where any candidate could advance through ranked-choice ballots.