From MSNBC.com

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SAN FRANCISCO - In a monumental victory for the gay rights movement, the California Supreme Court overturned a voter-approved ban on gay marriage Thursday in a ruling that would allow same-sex couples in the nation's biggest state to tie the knot.

Domestic partnerships are not a good enough substitute for marriage, the justices ruled 4-3 in an opinion written by Chief Justice Ron George.

Outside the courthouse, gay marriage supporters cried and cheered as news spread of the decision.

"Our state now recognizes that an individual's capacity to establish a loving and long-term committed relationship with another person and responsibly to care for and raise children does not depend upon the individual's sexual orientation," the court wrote.

The city of San Francisco, two dozen gay and lesbian couples and gay rights groups sued in March 2004 after the court halted San Francisco's monthlong same-sex wedding march.

"Today the California Supreme Court took a giant leap to ensure that everybody — not just in the state of California, but throughout the country — will have equal treatment under the law," said City Attorney Dennis Herrera, who argued the case for San Francisco.

Massachusetts is now the only U.S. state to allow gay marriage. Connecticut, New Hampshire, New Jersey and Vermont permit same-sex civil unions that grant largely the same state rights as married couples but lack the full, federal legal protections of marriage.

"I respect the court's decision and as governor, I will uphold its ruling," said Gov. Arnold Schwarzenegger in a statement. "Also, as I have said in the past, I will not support an amendment to the constitution that would overturn this (ruling)."

An initiative drive is under way in California to change the state constitution to restrict marriage to members of the opposite sex.