So what could possibly be more important than fighting against gay marriage to a conservative...hmmm let's see... maybe fighting against terrorists? Maybe downsizing government spending and expansion? Maybe fighting judicial activism before they give us additional social edicts like gay marriage? Maybe stopping illegal immigration?
Barring a Constitutional Amendment on the subject, which is extremely unlikely to succeed at present, there is little that can be done on gay marriage without appointing a Contitutionalist to the SCOTUS to replace one of the older liberal Justices (Breyer, Ginsburg, Kennedy).