[JURIST] Six couples filed a federal lawsuit [complaint] Thursday challenging South Dakota's ban on same-sex marriage [JURIST backgrounder]. The lawsuit, filed in the US District Court for the District of South Dakota [official website], challenges a law [text] passed by the legislature in 1996 and a constitutional amendment [text] approved by voters in 2006. The suit claims that the laws violate the equal protection, due process and right to travel clauses of the Fourteenth Amendment [text] to the US Constitution....

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