I respectfully disagree. As evidenced by the 15th, 19th, 24th and 26th Amendments for example, before the states ratified these amendments the states had the 10th Amendment-protected power to prohibit otherwise qualified voters from voting on the basis of race, sex, tax status and age.
Again, this is basically why the states are free to make laws to prohibit gay marriage. Since the states have never amended the Constitution to expressly protect gay “marriage,” the states are free to make laws which discriminate against such “marriage,” prohibiting it for example.
I don’t see where we disagree.