Sen. Joe Manchin III (D-W.Va.) said Tuesday that he will vote for the Employment Non-Discrimination Act, getting the measure closer to clearing procedural hurdles next week when it's expected to be brought up for votes in the Senate.

Manchin, a moderate from a socially conservative state, was the last current Democratic senator to sign on to the proposal. ENDA, which supporters have pushed to pass for years, would ban workplace discrimination based on sexual preference or gender identity.

As of Tuesday morning, the bill has 59 supporters or co-sponsors, one vote short of the support needed to clear the 60-vote threshold to avoid a filibuster.