Damn Straight!
If one enters into a legal contract with another person and that contract confers certain rights and responsibilities according to the laws of the state, then that should be how marriage is defined according to rights and responsibilities according to the state. Such a contract should not discriminate according to race, creed, background, or indeed sexual orientation.
Now if one desires that this contract be sanctified by a given religion, it is their privilege to do so and indeed it is the right of any given religious sect to refuse such sanction. But regardless of any religious sanction, such a verdict should involve no legal validity as it violates the establishment cause.
The legal business of marriage belongs to the state, as in rendering to Ceasar, the ideological consideration belongs to the church, as is what the couple may desire according to their rendering to whatever god they may choose, or be rejected by the laity, as the case may be.
Not damn straight at all. It is an issue between two people who are are not straight at all. I should say between two consenting adults.