In the open Massachusetts 6th Congressional District Democratic primary set for September 1, former White House aide Dan Koh's trader consensus at 79.5% stems from his dominant Q1 fundraising haul of $1.5 million—bringing his total to about $3.5 million without corporate PAC money—far outpacing rivals like self-funded fintech executive John Beccia, who invested $2 million personally. Koh was the first candidate to qualify for the ballot in late March by gathering over 2,000 signatures, while high-profile endorsements from Pete Buttigieg, Marty Walsh, and over 60 local officials signal strong establishment support in this crowded field of 11 Democrats replacing Seth Moulton, now challenging Sen. Ed Markey. Recent candidate forums highlight debates on health care and immigration, but Koh's momentum keeps others like Tram Nguyen and Mariah Lancaster fragmented below 6%.