Dan Koh leads the MA-06 Democratic primary with strong trader consensus, driven by a late-July/early-August poll showing him at 34% support among likely voters—a 19-point margin over the next closest contenders. As the September 1 primary approaches, Koh’s early ballot access, prior congressional run, and experience as a former White House official and Andover selectman have consolidated support in a crowded field that includes state Representative Tram Nguyen and local figures such as John Beccia. A recent candidate forum and endorsements have reinforced his frontrunner status, while the remaining candidates trail with single-digit or lower shares and limited recent movement in surveys. The open seat following Seth Moulton’s departure has drawn a broad field, but polling trends and timing favor Koh’s position heading into primary day.