The issue is that to pass the senate they need 25 votes, right now they have only have 22 firm yes votes which is good as it is 22-18 in favor of equality. Matter of fact two of those firm yes votes are state republicans, Senator Steve Litzwo, from the 41st district (Mercer Island) and Senator Cherly Pflug, from the 5th district (Maple Valley) are in the firmly for marriage equality camp, with Senator Cherly Pflug saying " I don't feel diminished when another human being is allowed to exercise the same rights that I enjoy"..."I would feel diminished if I voted to deny others the right to exercise those same rights and freedoms"
This now leaves us with the Senators who have not quite committed to one side or the other, of those there is Democratic Senator; Senator Rosemary McAuliffe, from the 1st district (Bothell) she has indicated that she is likely to vote for the bill but is not willing to commit herself yet. Then we have Democratic Senator Brian Hatfield, from the 19th district (Raymond) as well as Democratic Senator Jim Kastama, from the 25th district (Puyallup) and rounded out by Democratic Senator Paull Shin, From the 21st district. (Edmonds) There are also two Republican Senators who have not committed one way or another on how they will vote on the up coming marriage equality bill, those are Senator Joe Fain, from the 47th district (Auburn) and Senator Andy Hill From the 45th district (Redmond) both come from suburban districts and both also happen to be freshmen senators. They both claim to be talking it over with their constituents.
Then there is Democratic Senator Mary Margaret Haugen, from the 10th district (Camano Island) has stated that she will not vote for any bill that dose not have a provision for the voters to vote on it, which in since sources very close to the bill (openly gay Seattle Democratic Senator Ed Murray) have stated that it will not have such a provision in it, she can be counted as a no vote. (unless she has a change of hart at the last moment)
Not only is there a strong push to get this bill passed now just in case it winds up being dragged into a referendum because so that it would wind up falling during the November election, but there is another reason. With Governor Gregoire not running for a third term. (as she announced back in June of last year) Right now with the only declared democrat US Representative Jay Inslee and the declared republican candidate State Attorney General Rob McKenna and Pastor Shahram Hadian, with Mckenna being the most likely to be the one actually making it to the election. The worry is that Mckenna could win, and he has already voiced his opposition to same-sex marriage equality, and he could win, he has been voted into the office, he has served two terms as State Attorney General with him receiving 59% of the vote during his last election in 2008. He has the advantage of not quite being perceived as a hardcore republican (although his decision to drag the state into the federal lawsuit over Obama health care reform bill did ruffle quite a few feathers) and has enjoyed support among republicans independents and democrats in the past, me being one of them during his reelection to the job of Attorney General in 2008.