KLFY Channel 10 News in Lafayette is reporting that Louisiana State Judge Edward Rubin has ruled that the state’s law banning same-sex 
marriage is unconstitutional because it violates the due process clause of the 14th Amendment to the U.S. Constitution, the equal protection clause of the 14th amendment and the full faith and credit clause of the Constitution.
That’s all I can find on the ruling right now, but Rubin’s ruling is in direct contrast to a ruling earlier this month by federal Judge Martin L. C. Feldman in Louisiana that the state’s gay marriage is not unconstitutional. Feldman’s ruling on Sept. 3 is the only ruling in favor of gay marriage bans.
