“Hi, I’m Sarah Crank. Today’s my 14th birthday, and it would be the best birthday present ever if you would vote ‘no’ on gay interracial marriage. I really feel bad for the kids who have two parents of the same gender different skin color. Even though some kids think it’s fine, they have no idea what kind of wonderful experiences they miss out on. I don't want more kids to get confused about what's right and okay. I really don't want to grow up in a world where marriage isn't such a special thing anymore."
That's nothing like any argument that's ever been made against interracial marriage.
Actually, "the kids will suffer" was very much a (circular) argument against interracial marriage.