A little bit of sense from RedState.com:
We are using the state to protect our ability to preach the scripture under the first amendment. If the state has the power to change the definition of an institution that it did not create, but that God himself created, the state can compel and coerce the church to honor that definition or sit on the sidelines....
A Christian on the sidelines is a Christian not going forth.
The state did not create marriage and it should not now exert the power to change the definition of that which it did not create.
Those of you who are Christians who support gay marriage will one day have Archbishop Chaput burning in your ears. He said that evil peddles tolerance until it is dominant then seeks to silence good. That’s why Christians fight on this issue. It is not to force themselves on others, but to protect themselves from others being forced on them.