Incumbent Senator Ed Markey maintains a strong position in the Massachusetts Democratic Senate primary due to recent polling showing double-digit leads over Representative Seth Moulton, including a Suffolk University/Boston Globe survey with Markey at 52% to Moulton's 38% among likely primary voters. Markey secured overwhelming endorsement support at the state Democratic convention and benefits from backing by prominent progressives, while Moulton's emphasis on generational change and the incumbent's age has not produced consistent gains in surveys conducted through mid-August. With the September 1 primary approaching, other candidates remain at negligible levels. Late developments such as shifts in turnout among moderates or independents or unexpected campaign events could still influence the final outcome.