California voters will have a chance in November to protect the rights of gay men and women, and to preserve the state’s Constitution. They should vote against Proposition 8, which seeks to amend that Constitution to prevent people of the same sex from marrying.

The measure would overturn a firmly grounded State Supreme Court decision that said everyone has a basic right “to establish a legally recognized family with the person of one’s choice.” It said the state’s strong domestic partnership statute was inadequate, making California the second state to end the exclusion of same-sex couples from marriage. Massachusetts did so in 2004.

Whether this important civil rights victory endures is now up to California voters. Opponents of giving gay couples the protections, dignity and respect that come with marriage are working furiously to try to overturn the court ruling through Proposition 8. It is our fervent hope that Californians will reject this mean-spirited attempt to embed second-class treatment of one group of citizens in the State Constitution.

If passed, Proposition 8 would add language to the State Constitution stating that “only marriage between a man and a woman is valid or recognized in California.” Supporters of the amendment complain about the “activist” judges who wrote the court decision. But the majority in the 4-to-3 ruling was acting to protect a vulnerable group from unfair treatment. Enforcing the state’s guarantee of equal protection is a job assigned to judges.