Dan Koh leads the MA-06 Democratic primary field with roughly four-fifths implied probability, driven by his substantial fundraising edge—over $3.5 million raised with millions in reserves—combined with prior congressional experience and federal service in the Biden administration. Recent internal and independent polls from late July and early August show Koh at 34%, establishing a double-digit advantage over state Rep. Tram Nguyen and attorney John Beccia. The September 1 primary is three weeks away, with voter outreach, broadcast ads, and candidate forums in Lynn and elsewhere shaping late momentum. Nguyen remains the clearest alternative, backed by her legislative record and targeted endorsements, though her lower cash position limits visibility relative to Koh. Minor candidates trail far behind in both polling and resources.