Today the California Supreme Court overturned a voter-approved ban on gay marriage.   In striking down the ban 4 to 3 the justices rules that the limited rights of a domestic partnership would not substitute for the rights afforded by marriage.  "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. (Quote taken from the AP story by Lisa Leff).  The rights could be taken away swiftly if California voters approve a constitutional amendment being offered by a coalition of conservative forces.