Jenni Chang and Lisa Dazols had a wedding ceremony three weeks ago, but are hoping Wednesday's Supreme Court decision will allow them to follow up with a legal marriage.
"It puts our relationship on an equal place with any other relationship," Dazols said.
But critics say if the Supreme Court rules against Prop 8, traditional marriages will be marginalized as well as the will of the voters who approved the ban on same-sex marriages back in 2008.
"Having the will of the people of California and a referendum is sacred and this will wreak havoc on the proposition process in California," Catholics for the Common Good spokesperson Tom Loarie said.
The justices could uphold Prop 8, or strike it down with a broad ruling that would apply across the country, or a narrow one that impacts only California.
San Francisco City Attorney Dennis Herrera has been involved in the litigation from the start and was at the Supreme Court when the arguments were made back in March.
"At the arguments it was clear there weren't five votes in the chamber to uphold Prop 8, so I feel fairly confident we'll see marriage equality return here to California," he said.
At the county clerk's office they've been busy preparing for the possibility Prop 8 will be overturned. They've trained 64 volunteers, including Joel Engardio, on how to issue marriage licenses and perform weddings.
"The first day weddings are allowed, we signed up for shifts, four hour shifts; as the demand warrants we'll be here to help," Engardio said.
Among those waiting for the decision is Lt. Gov. Gavin Newsom. He is one of the major players who forced the same sex marriage case.
"It's an exciting moment in time for those that matter the most and those are the people that have not been afforded the ability to say something that 99.9 percent of us take for granted and that's 'I do,'" said Newsom.
Newsom thinks the most likely outcome is a narrow ruling that upholds gay marriage only in California.
"That's my gut. That means California can begin the process of granting marriage licenses in the worst case in about 30 days, in the best case the lower court, the 9th Circuit, can lift the stay immediately and process marriage applications as early as tomorrow or the next day," said Newsom.
The Proposition 8 decision will likely be announced shortly after 7 a.m. PST.
Q. What if the Supreme Court upholds Proposition 8?
A. This would leave gay Californians without the right to marry in the state and would tell the roughly three dozen states that do not allow same-sex marriages that there is no constitutional problem in limiting marriage to a man and a woman.
Such an outcome probably would trigger a political campaign in California to repeal Proposition 8 through a ballot measure, which opinion polls suggest would succeed, and could give impetus to similar voter or legislative efforts in other states. Proposition 8 itself was adopted by voters in 2008, but there has been a marked shift in Americans' attitudes about same-sex marriage in the past five years.
Q. What if the court strikes down Proposition 8?
A. A ruling in favor of the two same-sex couples who sued to invalidate the gay marriage ban could produce one of three possibilities. The broadest would apply across the country, in effect invalidating constitutional provisions or statutes against gay marriage everywhere.
Or a majority of the justices could agree on a middle option that applies only to California as well as Colorado, Hawaii, Illinois, Nevada, New Jersey and Oregon. Those states already treat gay and straight couples the same in almost every respect through civil unions or domestic partnerships. The only difference is that gay couples there are not allowed to marry.
This so-called seven-state solution would say that the Constitution forbids states to withhold marriage from same-sex couples while giving them all the basic rights of married people. But this ruling would not implicate marriage bans in other states and would leave open the question of whether states could deprive gay couples of any rights at all.
The narrowest of these potential outcomes would apply to California only. The justices essentially would adopt the rationale of the federal appeals court that found that California could not take away the right to marry that had been granted by the state Supreme Court in 2008, before Proposition 8 passed.
In addition, if the Supreme Court were to rule that gays and lesbians deserve special protection from discriminatory laws, it is unlikely that any state ban on same-sex marriage could survive long, even if the justices don't issue an especially broad ruling in this case.
Q. Are there other potential outcomes?
A. Yes, the court has a technical way out of the case without deciding anything about same-sex marriage. The Proposition 8 challengers argue that the private parties defending the provision - members of the group that helped put the ban on the ballot - did not have the right to appeal the trial judge's initial decision striking it down, or that of the federal appeals court.
The justices sometimes attach great importance to this concept, known as "standing". If they find Proposition 8's proponents lack standing, the justices also would find the Supreme Court has no basis on which to decide the case.
The most likely outcome of such a ruling also would throw out the appeals court decision that struck down the ban but would leave in place the trial court ruling in favor of same-sex marriage. At the very least, the two same-sex couples almost certainly would be granted a marriage license, and Gov. Jerry Brown, D-Calif., who opposes Proposition 8, probably would give county clerks the go-ahead to issue marriage licenses to same-sex couples.
Q. Are the possibilities for the DOMA case as complicated?
A. No, although there are some technical issues that could get in the way of a significant ruling.
Q. What happens if the court upholds Section 3 of DOMA, defining marriage for purposes of federal law as the union of a man and a woman?
A. Upholding DOMA would not affect state laws regarding marriage but would keep in place federal statutes and rules that prevent legally married gay Americans from receiving a range of benefits that are otherwise available to married people. These benefits include breaks on estate taxes, health insurance for spouses of federal workers and Social Security survivor benefits.
Q. What if the court strikes down the DOMA provision?
A. A ruling against DOMA would allow legally married gay couples or, in some cases, a surviving spouse in a same-sex marriage, to receive benefits and tax breaks resulting from more than 1,000 federal statutes in which marital status is relevant. For 83-year-old Edith Windsor, a New York widow whose case is before the court, such a ruling would give her a refund of $363,000 in estate taxes that were paid after the death of her spouse, Thea Spyer. The situation could become complicated for people who get married where same-sex unions are legal, but who live or move where they are not.
Q. What procedural problems could prevent the court from reaching a decision about DOMA?
A. As in the Proposition 8 case, there are questions about whether the House Republican leadership has standing to bring a court case to defend the law because the Obama administration decided not to.
House Republicans argue that the administration forfeited its right to participate in the case because it changed its position and now argues that the provision is unconstitutional.
If the Supreme Court finds that it does not have the authority to hear the case, Windsor probably would still get her refund because she won in the lower courts, but there would be no definitive decision about the law from the nation's highest court and it would remain on the books. It is possible the court could leave in place appeals court rulings covering seven states with same-sex marriage: Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island and Vermont.
Bay City News contributed to this report.