Dan Koh’s commanding position in the Massachusetts 6th District Democratic primary stems from his early fundraising dominance—raising more than $3.5 million by late March—and high-profile endorsements, including former President Biden’s public support in early May. As a former White House aide and Andover select board member, Koh benefits from broad district-wide donor networks and name recognition in a race opened by Seth Moulton’s Senate bid. Recent ballot qualification by multiple challengers and the withdrawal of Rick Jakious have consolidated attention on Koh, while competitors such as Tram Nguyen and John Beccia maintain narrower geographic or self-funded bases. Traders price this resource and visibility gap as decisive ahead of the September 1 primary.