Dan Koh secured the Democratic nomination for Massachusetts’ 6th Congressional District in a September 2026 primary after the seat opened with Seth Moulton’s Senate bid. The district’s consistent Democratic performance, reflected in its partisan voting index and prior results, underpins trader consensus favoring Koh at over 96 percent. He holds a substantial fundraising edge and endorsements from former Biden administration figures, while Republican nominee Micah Jones, an unopposed Army veteran and attorney endorsed by former Governor Charlie Baker, faces structural headwinds in the solidly blue North Shore and Merrimack Valley area. Late developments such as a major scandal, health issue, or sharp national political shift could still narrow the margin before the November 3 general election, though current evidence shows limited signs of such movement.