Boston GlobeSEIU Endorses Markey In US Senate PrimaryWBURBOSTON — One of the state's largest labor unions has endorsed Democratic U.S. Senate hopeful Edward Markey. The Massachusetts Service Employees International Union (SEIU) says it represents 85,000 workers across the state. SEIU Massachusetts …SEIU endorses Markey over LynchBoston.comMassachusetts SEIU endorses Ed Markey in special Senate electionMassLive.comSEIU endorses Markey for Mass. SenateThe Hill (blog)Huffington Post -National Journal (blog)all 18 news articles …read more