An Iowa district court ruled Thursday that same-sex couples can marry based on the state constitution's guarantee of equal treatment, court documents show.
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An Iowa district judge ruled in favor of same-sex marriage.

The ruling was in response to a December 2005 lawsuit brought by six same-sex couples seeking to wed. They were denied marriage licenses and claimed such treatment violates equal-protection and due-process clauses in the Iowa constitution.

The court also struck down a state law declaring valid marriages are only between a man and woman.

The Iowa District Court for Polk County advances the case to the Iowa Supreme Court which will make a final decision on same-sex marriage, according to Lambda Legal, a gay and lesbian legal organization representing the couples.