Yes, there is no explicit statute that says that an official can be punished for preventing gay marriage, but new case law would make this an offence and a lowe

Yes, there is no explicit statute that says that an official can be punished for preventing gay marriage, but new case law would make this an offence and a lower court might need to establish further new case law to decide what an appropriate punishment might be for the official or state that does try to block it within the legal context of similar violations of law both in statute and case law. Basically they would get fired for not performing their duties as an official.