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Democratic presidential candidate Bernie Sanders will pick up the endorsement of the Communications Workers of America on Thursday as he edges closer to Hillary Clinton's list of union endorsements.

With over 700,000 members, CWA is one of the largest unions in the United States and by far the biggest to back Sanders over Clinton so far. Sanders has run as a labor-friendly candidate but has had trouble convincing labor leaders to ignore Clinton's front-runner status.

In addition to CWA, Sanders has received major endorsements from the National Nurses Union, the American Postal Workers Union, United Electrical Radio and Machine Workers of America and the National Union of Healthcare Workers. In October, the Vermont senator also introduced a bill to make it easier for workers to organize, something he said was "essential" to reverse growing income inequality.

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