Tuesday's state Supreme Court ruling upholding Proposition 8, the California Constitution amendment banning same-sex marriage, sets gay rights advocates up for a 2010 ballot proposition to repeal the ban.

On Tuesday night's "Tonight Show," Gov. Arnold Schwarzenegger told host Jay Leno he thinks the gay marriage ban will be short-lived."This is not over," he said. "They're gonna be back. In a year or two, they will be back again with another initiative, trying to get it, you know. And eventually it's gonna be overturned, I'm sure of that."

And on "The Rachel Maddow Show," Sen. Barbara Boxer (after praising Obama's nomination of Sonia Sotomayor for the U.S. Supreme Court) expressed her disappointment with the state Supreme Court ruling upholding Prop. 8.

"If you read the California Constitution, it basically says that everyone has equal rights and equal protection under the law," she said. "We're gonna have to have another battle in California, and this time I hope that people of goodwill will come together across party lines, across the state and say in our state, everyone must be treated equally."

A 2010 proposition could take one of three forms, according to petition website www.rightsagainin2010.com: a constitutional amendment repealing Prop. 8, a constitutional amendment preventing the state from involving itself in marriages (allowing people to file taxes as "partners" and leaving marriage recognition to faith groups), or a constitutional amendment contradicting Prop. 8 and sending the issue back to court.

There are already indications that the 2010 ad campaign may be bolder than last year's, which employed abstract language about equal rights but rarely used the "g"-word. The Courage Campaign's new TV ad, by contrast, features actual same-sex couples and likens the issue of gay marriage to other civil rights battles.

On Tuesday folllowing the ruling, nearly 100 gay marriage supporters gathered to hear speakers in front of Monterey's Colton Hall, then marched past the Farmers Market on Alvarado Street to Window on the Bay Park.

The ruling did not affect the roughly 18,000 same-sex marriages performed in the six-month window they were legal in California, from last May through November.