Trader consensus heavily favors Dan Koh at 82% implied probability to win the open MA-06 Democratic primary on September 1, driven by his dominant fundraising—raising over $200,000 in January alone, outpacing rivals' combined totals, with campaign reports exceeding $3.5 million—and high-profile endorsements from Pete Buttigieg, former Labor Secretary Marty Walsh, and major building trades unions. These advantages, plus being first to qualify with over 2,000 signatures, have solidified his frontrunner status amid a crowded field, including Rachel Creemers and Diann Slavit Baylis as distant challengers. Recent Rick Jakious dropout narrows competition, though late endorsements or polling shifts could alter dynamics before early voting.