Like these once prevalent views, our conventional understanding of marriage must yield to a more contemporary appreciation of the rights entitled to constitutional protection. Interpreting our state constitutional provisions in accordance with firmly established equal protection principles leads inevitably to the conclusion that gay persons are entitled to marry the otherwise qualified same sex partner of their choice. To decide otherwise would require us to apply one set of constitutional principles to gay persons and another to all others. The guarantee of equal protection under the law, and our obligation to uphold that command, forbids us from doing so. In accordance with these state constitutional requirements, same sex couples cannot be denied the freedom to marry.
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Update: The dissents promise some great fun (1, 2, 3), with pouty italics and bigotry dressed up in the highest style of intellectual finery, but let's hold off on them for another day.
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Update 2: It's a 4-3 opinion, for the record.