I really like this ad from Minnesotans United for all Families, the group opposing the state constitutional amendment to ban marriage equality, because it talks about values, a topic that heterosexual supremacists always seem to be bringing up. Believers in equality have values as well, especially the value of the Golden Rule (Treat others as you want to be treated).
I think the effect of this ad is two fold: it discusses that children get values from their parents (thus blunting the ridiculous and misleading argument that somehow marriage equality will cause some kids to be taught particular values about marriage--there is no connection between the two things!) and that the most important value should be the Golden Rule, with the obvious implication that voting to ban someone else's marriage is clearly wrong because you wouldn't want your marriage banned by voters.
Minnesota is probably the toughest battle of the four marriage equality ballot measure fights we are facing this Fall, but it is good to see that some new and strong arguments are emerging that could be deployed in other, future fights over this issue.