Dan Koh holds the strongest position in the Massachusetts 6th District Democratic primary due to his substantial fundraising edge, with over $3.5 million raised compared to far lower totals for other contenders, alongside prior congressional experience in the region and endorsements from high-profile figures. State Representative Tram Nguyen has gained traction in recent internal polling, including a late-May survey showing her ahead, but trails significantly in resources and name recognition. The September 1 primary remains months away in a crowded field, leaving room for shifts based on further voter outreach, additional endorsements, or campaign momentum in this open-seat contest. Trader consensus reflects these structural advantages for Koh while assigning lower probabilities to the rest of the field.