Later this evening, the Washington State Senate is scheduled to vote on the marriage equality bill recently passed by the state’s Senate Government Operations, Tribal Relations, and Elections Committee, as reported on Towleroad.

Based on a report by Reuter’s “proponents had secured the 25 votes needed for a simple majority in the 49-seat chamber.” This means that Washington could join New York, Massachusetts, Connecticut, Vermont, New Hampshire and Iowa as well as the District of Columbia in marriage equality.

If the measure passes, Washington State Governor Christine Gregorie has promised to sign the bill when it crosses her desk.

Even though the passage of the bill seems a done deal, opponents of the measure are planning a referendum to take the matter to the voting booths.