I have no problem with gay marriages. If 2 people really love each other and want to spend the rest of their lives together I don't think their sex should matter.
I would rather see 2 people of the same sex that are commited to each other than a person of either sex that will sleep with anyone. Not meaning I want to see PDA. Don't want to see affection outside of hand-holding, hugs from anyone. At least not on public.
And I agree with lonestar. two people commited to long term should be privvy to the same benefits as hetero marriages. If gay marriage is not affecting you personally and it bugs you, you either have too much time on your hands or are like most nosy religoius fanatics who think they know what's right for everyone.