Vice President Joe Biden's decision to not mount a challenge to Hillary Clinton's presidential bid may pay her another benefit next week: the endorsement of the 2 million-member Service Employees International Union.

The union's executive board will meet Tuesday to discuss its presidential endorsement. It is likely the board will officially back Clinton, according to a report, dashing the hopes of rival candidate Sen. Bernie Sanders, I-Vt., who has lobbied hard for union support. The possibility that Biden might jump in had been holding the board back, but the vice president announced last month he would not run.

SEIU is a major player in Democratic politics. It is one of the largest unions in the country, representing everyone from service-sector workers to nurses and government employees. In the 2014 election cycle, it spent $23.6 million exclusively favoring Democratic candidates.

Clinton already has won the endorsements of several other major unions, including the American Federation of State, County and Municipal Employees, the National Education Association and the American Teachers Federation. The likely SEIU endorsement was reported by Politico.

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