The Communications Workers of America (CWA) on Thursday endorsed Sen. Bernie Sanders (I-Vt.) for president in the 2016 election, citing the need for a candidate who will “break with politics-as-usual and fight for America’s working people.”

The endorsement comes after a three-month voting period, with tens of thousands of the union’s 700,000 members casting ballots. Its former president, Larry Cohen, is an adviser to Sanders’ campaign. It also comes hours after his chief rival for the nomination, former Secretary of State Hillary Clinton, picked up the endorsement of billionaire Warren Buffett.

“CWA members, like voters across America, are saying we can no longer afford business as usual. Bernie has called for a political revolution – and that is just what Americans need today.” —Chris Shelton, CWA PresidentCWA is now the third national labor organization to throw its weight behind Sanders, who was also recently endorsed by National Nurses United and the American Postal Workers Union.

“CWA members have made a clear choice and a bold stand in endorsing Bernie Sanders for President,” said the union’s president, Chris Shelton. “I am proud of our democratic process, proud of CWA members, and proud to support the candidate whose vision for America puts working families first. Our politics and economy have favored Wall Street, the wealthy and powerful for too long. CWA members, like voters across America, are saying we can no longer afford business as usual. Bernie has called for a political revolution – and that is just what Americans need today.”

In response to CWA’s announcement, Sanders said, “Brothers and sisters, let me thank the 700,000 members of the Communications Workers of America for their strong support.” He reiterated his campaign promises to raise the federal minimum wage to $15 an hour and eliminate college tuition.

“We’re going to create an economy that works for the middle class and working people of America—not just the billionaires,” he added.