Incumbent Ed Markey maintains a clear edge in the Democratic primary for Massachusetts Senate, backed by consistent polling leads among registered Democrats and strong support from liberal voters, women, and older blocs. Recent Emerson College polling from early May shows Markey ahead of challenger Seth Moulton by five points with nearly 30 percent undecided, narrowing from wider margins in prior surveys but still reflecting the advantages of long-term incumbency and name recognition. Moulton has gained ground among moderates and unenrolled voters by emphasizing generational change and policy contrasts, yet trails in core primary turnout groups. Minor candidates Alexander Rikleen and Ayanna Pressley register negligible support, leaving the race focused on these two contenders ahead of the September primary.