[hemogoblin]

Gay marriage does to real marriage what counterfeit money does to real money.

Another way of looking at it, that your profs might begin to grasp: "Just as you don't want to see a pristine, natural vista cluttered up with unnatural condos and fast-food retaurants, so do I not want to see marriage clutttered up with unnatural fabrications."

[pgyanke]

Gay marriage does to real marriage what counterfeit money does to real money.

VERY well put. If you don't mind, I think I have found a new tagline...