Incumbent Sen. Ed Markey maintains a dominant position in the Massachusetts Democratic Senate primary, as shown by recent polling trends favoring the veteran senator by double-digit margins over Rep. Seth Moulton. Markey benefits from strong backing among progressives, women, and liberal primary voters, along with high job approval ratings within the Democratic base and consistent advantages on key issues. Moulton has centered his campaign on generational change and Markey's age, yet this message has not narrowed the gap in late surveys conducted ahead of the September 1 primary. Minor candidates, including Rep. Ayanna Pressley, register negligible support. While final debate performances or shifts among remaining undecided voters could influence turnout, the current polling trajectory and Markey's established statewide profile underpin the market's assessment of his strong likelihood of nomination.