As of right now, the federal government has no jurisdiction over marriage of any kind. If the Supreme Court legalizes it or the Constitution is ammended to ban it, it would give the federal government jurisdiction over marriage, which they definitely should not have. If California wants to legalize it, that's their deal. This power should in no way, shape, or form be given to the federal government.
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The Contortionist: Language I: Intuition
The states should decide by voting on it. If the public wants the changes and agrees, it should be OK.
The federal government should stay out.
What bothers me is when the courts over turn the will of the people. That is a slippery slope.
Another things is the special protected class that they seek. I don't agree.