Troy Jackson, a former ally of Graham Platner, has built a significant lead in the Maine Democratic primary race to replace Platner and challenge Republican Sen.Susan Collins.With 300 of 319 delegate slots secured in county-level elections, Jackson is on track to win the nomination at the July 25 convention.

His campaign emphasizes progressive policies such as Medicare for All, higher taxes on billionaires, and abolishing Immigration and Customs Enforcement (ICE).

Platner's exit from the race, following scandals including a rape allegation, has opened the path for Jackson, who previously supported Platner's progressive movement.Jackson's understated style contrasts with Platner's fiery rhetoric, but he has directly appealed to Platner's former supporters.The July 25 convention in Bangor will determine the Democratic nominee, with 601 delegates expected to vote.Jackson's platform aligns with Sen.Bernie Sanders' working-class progressive agenda, positioning him as a key candidate in the Senate race.The race is critical for Democrats' control of the Senate, with Collins being a formidable opponent.

Jackson's focus on criticizing Collins for her support of ICE, particularly after an agent's fatal shooting in Biddeford, underscores the political tensions in the race.