Bernie Sanders just earned his biggest labor union endorsement yet

Bernie Sanders picked up the biggest labor endorsement of his presidential campaign on Tuesday when the 200,000-member American Postal Workers Union made its support official.

Said union President Mark Dimondstein in an announcement:

The union also championed Sanders' support of a $15 minimum wage, free public college tuition, and veterans' benefits, Politico reports.

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But even with APWU's support, the socialist senator still lags behind Hillary Clinton in labor endorsements. Just last month, the nation's largest trade union, the 1.6-million-member American Federation of State, County and Municipal Employees, endorsed the Democratic frontrunner. Clinton has also picked up eight other union endorsements, representing seven million members.