They argued the appeals court should grant a stay of Walker's order requiring state officials to cease enforcing Proposition 8 "to avoid the confusion and irreparable injury that would flow from the creation of a class of purported same-sex marriages."

Depending on how the 9th Circuit rules, same-sex couples could begin tying the knot in California as early as next week or be put off while the appeal works its way through the court and potentially the U.S. Supreme Court as well.

California voters passed Proposition 8 as a state constitutional amendment in November 2008, five months after the California Supreme Court legalized same-sex unions and an estimated 18,000 same-sex couples already had married.

In refusing to suspend his ruling for more than a few days, Walker agreed with the lawyers who sued to strike down the ban that it's unclear if Proposition 8's sponsors have legal standing to appeal.

Although he allowed the coalition of religious and conservative groups that sponsored the measure to defend the lawsuit during the 13-day trial over which he presided, the judge said appellate courts have different rules for deciding when a party is eligible to challenge a lower court.

Based on his interpretation of those rules, it appears the ban's sponsors can only appeal his decision with the backing of either Gov. Arnold Schwarzenegger or Attorney General Jerry Brown, Walker said. But that seems unlikely as both officials refused to defend Proposition 8 in Walker's court and said last week they see no reason why gay couples should not be able to tie the knot now.

Walker also turned aside arguments that marriages performed now could be thrown into legal chaos if Proposition 8 is later upheld by an appeals court. He pointed to the 18,000 same-sex couples who married legally in the five months that gay marriage was legal in California as proof.

San Francisco Chief Deputy City Attorney Therese Stewart, who during the trial helped argue that Proposition 8 should be overturned, said that while it will not be up to Walker to decide the eligibility issue, "it's very realistic" that the 9th Circuit could reach the same conclusion.

"We allocate the decision-making authority over how to enforce and defend and prosecute the laws to the executive branch," Stewart said. "Do you want every Tom, Dick and Harry second-guessing what the attorney general does and challenging every ruling the attorney general chooses not to?"

The ban's backers addressed the potential for such a roadblock in their emergency stay request, saying California's strong citizen initiative law permits ballot measure proponents to defend their interests when state officials refuse to.

"We are confident we do have standing to seek the appellate review here, and we realize this case has just begun and we will get the decision overturned on appeal," said Jim Campbell, an Alliance Defense Fund lawyer who is part of the legal team defending Proposition 8.

Other legal analysts think the appeals court will allow the group that raised $40 million to pass Proposition 8 to formally challenge Walker's ruling.

"What Judge Walker's ruling means is you can sponsor a proposition, direct it, research it, work for it, raise $40 million for it, get it on a ballot, successfully campaign for it and then have no ability to defend it independently in court," said Dale Carpenter, a University of Minnesota constitutional law professor who supports same-sex marriage. "And then a judge maybe let you be the sole defender in a full-blown trial and then says, 'by the way, you never can defend this.' It just seems very unlikely to me the higher courts will buy that."

Walker's order clearing the way for same-sex marriages to resume in California for the first time since 52 percent of the state's voters approved Proposition 8 nonetheless raised hopes among gay couples who flocked to government offices to await word that they soon will be able to exchange vows.

"We just want equal rights. We're tired of being second-class citizens," said Amber Fox, 35, who went to the Beverly Hills Municipal Courthouse on Thursday morning in hopes of marrying her partner. The couple wed in Massachusetts in June but wanted to make it official in their home state.

Teresa Rowe, 31, and her partner, Kristin Orbin, 31, said they were still happy with the decision even though the ceremony didn't happen. The couple went to San Francisco City Hall early Thursday morning to fill out a marriage license application.

"It's sad that we have to wait a little longer, but it's been six years," Rowe said.