Incumbent U.S. Senator Ed Markey commands 86.5% trader consensus for the Massachusetts Democratic Senate primary on September 3, bolstered by consistent polling dominance—including a mid-August Suffolk University survey showing him at 55% to Seth Moulton's 22%—and fundraising superiority with $4.8 million cash-on-hand versus Moulton's $1.2 million. Markey's progressive record and endorsements from Elizabeth Warren and state Democrats reinforce his hold on key voting blocs amid early voting underway. Moulton lingers at 9.5% as his centrist challenge struggles for traction, while Ayanna Pressley (not an entered candidate) holds 2.5% on write-in speculation, and Alexander Rikleen trails at 0.2%. No major shifts in the past week sustain Markey's incumbency edge.