The MA-08 Democratic primary remains closely contested between longtime incumbent Stephen Lynch and challenger Patrick Roath, with trader consensus reflected in the narrow probability spread. Lynch’s established name recognition and institutional advantages in a district spanning Boston suburbs and South Shore communities provide a baseline edge. Roath has narrowed the gap through early fundraising exceeding $1 million, a Boston Teachers Union endorsement representing over 10,000 members, and internal polling showing swings toward the challenger once voters receive candidate information. Minor candidate Andrew Zylberfink trails significantly. Upcoming candidate forums, additional endorsements, and independent polling before the September 1 primary could widen separation by clarifying turnout dynamics among Democratic primary voters.