"We are firmly convinced the exclusion of gay and lesbian people from the institution of civil marriage does not substantially further any* important governmental objective," the Supreme Court wrote in its decision. "The Legislature has excluded a historically disfavored class of persons from a supremely important civil institution without a constitutionally sufficient justification*."
Please read this article from the Associated Press for more information.
Any success in the fight for civil rights FOR ALL AMERICANS is a success for all of us (humans... earthlings, you know). I know this is a divisive topic, so I'll just leave it at the quote above, because I really can't say it (nor have I ever heard it better put) then the IA Supreme Court has said here.