Dan Koh leads the MA-06 Democratic primary with strong trader consensus driven by his extensive fundraising edge—over $4.5 million raised and millions in cash reserves—enabling sustained television and cable advertising that highlights his federal experience and opposition to Trump administration policies. Recent internal polling shows him ahead by double digits, while earlier surveys reflected a more fragmented field with Tram Nguyen, a sitting state representative emphasizing legislative work on affordability and housing, holding initial support. Other candidates including John Beccia and Jamie Zahlaway Belsito trail amid lower visibility and resources. With the September 1 primary approaching, Koh’s organizational and financial positioning has consolidated backing among likely Democratic voters.