Actually, he never said that the second couple got "legally married," and as such, the two marriages would not be considered the same by the government.
Once again, so long as a couple meets the requirements of marriage, they will be treated the same by government. A homosexual couple does not meet the requirements of marriage, so they cannot legally be married. However, if a homosexual individual should attempt to marry someone of the opposite sex, and be denied marriage because of his sexual preference, you would then have some standing to invoke the equal protection clause. Until then, you have failed to demonstrate what rights homosexuals are being deprived.