Incumbent Stephen Lynch holds a modest edge in trader consensus for the September 1 Democratic primary in Massachusetts’ 8th Congressional District, yet Patrick Roath’s positioning remains competitive following the Boston Teachers Union’s endorsement of the challenger. Roath, a Jamaica Plain attorney, has leveraged substantial fundraising and earlier backing from progressive groups to highlight generational and policy contrasts with the 25-year incumbent. These factors sustain market tightness ahead of the primary, with further union support, candidate forums, or polling shifts on education and federal funding issues likely to influence separation between the contenders.