U.S. presidential contender Hillary Clinton on Tuesday won the endorsement of the SEIU labor union, which has about 2 million members, in her quest to win the Democratic nomination for the November 2016 election.
The Service Employees International Union adds momentum to Clinton's bid to woo labor, a key Democratic constituency, as she seeks to build a coalition within her party and avert a damaging primary fight.
SEIU includes employees in a range of jobs, including public service and healthcare.
"Hillary Clinton has proven she will fight, deliver and win for working families," SEIU International President Mary Kay Henry said in a statement.
"SEIU members and working families across America are part of a growing movement to build a better future for their families, and Hillary Clinton will support and stand with them," she added.
Clinton has already won the endorsement of several other major unions, such as public service employee group AFSCME, the American Federation of Teachers and the National Education Association.
The former secretary of state remains the front-runner for the Democratic nomination.
She has support from 56 percent of her party, versus 31 percent for Vermont Senator Bernie Sanders, her main rival, in a five-day rolling poll by Reuters/IPSOS dated Nov. 13.
Sanders has won endorsements from National Nurses United and the American Postal Workers Union.
Labor is often a major source of volunteers and fundraising for Democrats in presidential elections.
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