Dan Koh maintains a commanding lead in the MA-06 Democratic primary due to his substantial fundraising edge—over $4.5 million raised with millions in cash on hand—combined with endorsements from former President Biden, Vice President Harris, and numerous local officials, alongside internal polling showing a 15-point advantage over rivals just days before the September 1 vote. State Representative Tram Nguyen trails as the main challenger, bolstered by recent endorsements including from withdrawn candidate Mariah Lancaster and appeals as a progressive alternative with state legislative experience, though her campaign has raised far less. John Beccia has invested millions personally but lags in polls and momentum. The remaining candidates trail with minimal support. Trader consensus reflects these resource and organizational disparities heading into the final days of campaigning.