Prop 3: Californians pass measure to protect marriage rights for all, ABC News projects

California's Proposition 3, the path to legalizing marriage for same-sex couples, will pass, ABC News projects.

The path to legalizing marriage for same-sex couples in California has been filled with legal ups and downs since San Francisco first issued marriage licenses in 2004.

After those unions were later ruled invalid, the California Supreme Court legalized marriages for same-sex couples in 2008, but just months later voters in the state passed Proposition 8, which defined marriage between a man and a woman in the state constitution.

The video in the media player above is from a previous report.

Two years later, a federal court ruled Proposition 8 was unconstitutional and then, in 2015, the U.S. Supreme Court legalized marriage for same-sex couples across the country.

But the language placed in the California Constitution by Proposition 8 has never been removed.

State Senator Scott Wiener worries that the U.S. Supreme Court could reverse its 2015 decision on marriage for same-sex couples much like it reversed Roe v. Wade, which had guaranteed the constitutional right to an abortion.

"In 2008, the voters put a ban on LGBT marriage in the constitution. That language is still in there. It's not enforceable today. It's a dead letter because the Supreme Court says people have a fundamental right to marry. But if the court was able to overturn its decision on same-sex marriage, then that dead-letter language would come back to life," said State Senator Scott Wiener, who co-authored Proposition 3, which would enshrine the right to marry in the state constitution.

That dead phrase in the constitution says, "only marriage between a man and a woman is valid or recognized in California."

Proposition 3 would eliminate that phrase and replace it with one that says, "The right to marry is a fundamental right."

It protects multi-partner families, people in asexual relationships, as well as single parents and multi-generational households, from discrimination in housing and civil services.

Proposition 3 is personal for Oakland residents Stephisha and Viveca Ycoy-Walton.

"We live in fear for others every day that it can happen because we have seen it," says Viveca Ycoy-Walton, who married her partner in 2013 after the U.S. Supreme Court struck down a lawsuit aiming to reinstate California's ban on same-sex marriage, thus reinstating the right to same-sex marriage in the state.

"It may seem like a formality. But that formality is the difference between somebody's happy ending or their disappointment and rejection," says Viveca.

The couple is active in campaigning for Proposition 3 to ensure the right to marriage for everyone is enshrined in the state constitution.

"Formalities matter. If it didn't matter it wouldn't still be there. And if it didn't matter we wouldn't have to fight to have it removed," says Stephisha Ycoy-Walton.

Being legally married allowed them to have both their names on their son's birth certificate, which helped put him at ease when he was being picked on at school.

"Somebody told me I was adopted because I had two moms," said Karter Ycoy-Walton, who felt confused by other kids teasing.

Seeing his birth certificate with both his mothers' names on it was comforting and reassuring.