Opponents say they have enough signatures to qualify Referendum 74 for the November ballot.
This will be the thirty-third time voters in the US will be asked to legalize same sex marriage. It has been rejected the previous 32 times.
Joseph Backholm, with Preserve Marriage Washington, the group that drove the signature gathering campaign, thinks the Washington decision will fall in line with previous votes.
"This is not about fairness or equality, this is about what is the definition of marriage and we expect Washington state will agree with the other states that marriage is between a man and a woman."
To learn more check out www.PreserveMarriageWashington.com.