What to know about the US primary election in Massachusetts

Voters in the US state of Massachusetts head to the polls on Tuesday for a primary election featuring a closely watched United States Senate contest between Democratic incumbent Senator Ed Markey and US Representative Seth Moulton. The race is the latest contest that pits the Democratic Party's progressive and moderate wings against each other. But in a twist, Moulton, the challenger, is part of the moderate New Democrat Coalition, while Markey, the longtime progressive incumbent, is fighting to hold on to his seat. What time do polls open and close in Massachusetts? The Massachusetts primary is Tuesday, September 1, 2026.