Answers for Michael S.

1.  Yes.

2.  No.  But the fact that heterosexual coupling is--or, at least, can be--"different in kind" does not entail that same-sex coupling is morally problematic.  See generally Margaret Farley, Just Love.

3.  Who said "SSM is analogous to interracial marriage"?  I didn't.  I said that a state's allowing for marriage, understood as a legal category, for same-sex couples is not more "statist" than its allowing for marriage, as a legal category, for interracial couples.