California Senator Diane Feinstein is calling on voters to vote against Proposition 8, the constitutional amendment that would ban gay marriage in the State.

“I urge Californians to oppose Proposition 8,” Senator Feinstein said in a statement.

The statement also endorsed gay marriage: “I oppose it [Prop. 8] as a matter of equality and fairness. The right to marry is fundamental. It provides social stability, economic equality, and the ability to make decisions for a spouse in a time of crisis. ... I believe we should uphold the ability of our friends, neighbors, and co-workers who are gay and lesbian to enter into the contract of marriage.”

Feinstein is the senior U.S. Senator from California. She first won her seat in 1992, after serving as mayor of San Francisco. She has reportedly shown interest in running for Governor of the Golden State in 2010.

The Democratic senator's remarks were quickly embraced by Equality California Executive Director Geoff Kors, who said: “We are truly grateful that Senator Feinstein has not only taken such a strong stand against Prop. 8, but has also come out in support of marriage for same-sex couples. Her leadership on this issue and her stand for fairness sends a powerful message to all Californians as right-wing organizations work to eliminate the right of same-sex couples to marry. We hope all Californians will follow her lead and oppose Prop. 8.”

Meanwhile, groups opposing gay marriage continue to pour money into California. Californians Against Hate, a group dedicated to exposing the anti-gay money trail, says gay marriage opponents are raking in nearly $10 million a month.