DC37, New York's largest municipal employee union, last week passed resolutions that express the organization's support for the marriage equality bill and the Gender Expression Non-Discrimination Act (GENDA).
This adds about 120,000 more members to the overall number of New Yorkers represented by unions in support of marriage equality, making the total somewhere close to 970,000. (read the marriage resolution here)
Unions supporting GENDA (so far) represent approx. 320,00 New Yorkers.