This is from the website you linked to:

<blockquote>If we go back to Locke, then, we see that the "pursuit of happiness" as envisaged by him and by Jefferson was not merely the pursuit of pleasure, property, or self-interest (although it does include all of these).  It is also the freedom to be able to  make decisions that results in the best life possible for a human being, which includes intellectual and moral effort.</blockquote>

I would interpret that as saying that Locke's "true happiness" for a gay couple would entail the right to marry each other. 

No, you have not even come close to establishing that the founding fathers agreed with you on anything.

RD, I have had courses in political philosophy. You clearly have not. Indeed, I wonder if you even had a high school civics class.