**Dan Koh's dominant 76.5% implied probability in the MA-06 Democratic primary stems from his unmatched fundraising haul of $3.5 million to date—more than any prior Massachusetts House candidate at this stage—and high-profile endorsements like Transportation Secretary Pete Buttigieg and IBEW Local 2222, signaling strong party establishment support in this open-seat race.** Incumbent Seth Moulton vacated the seat to launch a U.S. Senate primary challenge against Ed Markey, drawing a crowded field of nine Democrats ahead of the September 1 primary. Koh was first to qualify for the ballot in late March after gathering over 2,000 signatures, while challengers like Mariah Lancaster (7.6%) trail amid his January cash surge outpacing rivals combined. No public polls exist yet, but trader consensus reflects his financial edge and momentum from recent forums, though late endorsements or spending shifts could narrow the field.