But the California Supreme Court does.
"Furthermore, in contrast to earlier times, 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, and, more generally, that an individual’s sexual orientation — like a person’s race or gender — does not constitute a legitimate basis upon which to deny or withhold legal rights. We therefore conclude that in view of the substance and significance of the fundamental constitutional right to form a family relationship, the California Constitution properly must be interpreted to guarantee this basic civil right to all Californians, whether gay or heterosexual, and to same-sex couples as well as to opposite-sex couples."
"One of the core elements of the right to establish an officially recognized family that is embodied in the California constitutional right to marry is a couple’s right to have their family relationship accorded dignity and respect equal to that accorded other officially recognized families, and assigning a different designation for the family relationship of same-sex couples while reserving the historic designation of “marriage” exclusively for opposite-sex couples poses at least a serious risk of denying the family relationship of same-sex couples such equal dignity and respect. We therefore conclude that . . . to the extent the current California statutory provisions limit marriage to opposite-sex couples, these statutes are unconstitutional."
"In the present case, it is readily apparent that extending the designation of marriage to same-sex couples clearly is more consistent with the probable legislative intent than withholding that designation from both opposite-sex couples and same-sex couples in favor of some other, uniform designation."