Arkansas Senator Mark Pryor on Tuesday said he would vote for the Employment Non-Discrimination Act (ENDA), putting the legislation just two votes shy from passage in the Senate.

According to the Arkansas Times, Michael Teague, a member of Pryor's staff, responded to an inquiry on the legislation: “He'll vote yes on ENDA.”

On Monday, Florida Senator Bill Nelson signed on as a co-sponsor of ENDA.

The moves leave Senator Joe Manchin of West Virginia as the final Democratic holdout in the Senate.

LGBT rights advocate Freedom to Work is campaigning for Manchin's endorsement of the bill.

“Senator Manchin is now the last remaining Democrat who has not stated whether he will stand on the right side of history,” Tico Almeida, founder and president of Freedom to Work, said in an emailed statement.

“ENDA simply says a corporation can't fire you just because of who you are or who you love, and growing numbers of West Virginians have signed this petition urging Senator Manchin to support commonsense LGBT workplace protections,” he added, pointing to the group's petition asking Manchin to support the legislation.

ENDA, which seeks to prohibit workplace discrimination based on sexual orientation and gender identity, cleared a Senate committee in July. Three Republicans – Senators Mark Kirk of Illinois, Lisa Murkowski of Alaska and Orrin Hatch of Utah – joined all Democrats on the committee in sending the bill to the full Senate. A vote in the Senate is expected before Thanksgiving.

(Related: Harry Reid announces Senate vote for gay protections bill ENDA.)