My argument is simple which is that for several thousand years in Western civilization marriage has been the union of one man and one woman. Research is overwhelming that children need mothers and fathers.
Particularly black Americans many of them from quotes that I have seen and conversations I've had are sort of insulted that the civil rights movement is being hijacked – the rhetoric of the civil rights movement is being hijacked for something like same sex marriage. Black Americans tend to have a higher degree of religiosity.
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If one is going to change the definition of marriage to be quote 'same sex ' then there is absolutely no valid argument constitutionally or rhetorically you can make against multiple people getting married. These are radical social changes.