I see no reason, why 2 Consenting adults of the Same Sex can't marry, once you are an adult what you do in the privacy of your own home is your own busnies, this Nation right now has too many far more important issues to deal with then whether same sex couples can marry
If a same sex couple wants to marry, it has no effect on my life so why not let them

As Our Own Consistution even says:

The opening of the Declaration of Independence written by Thomas Jefferson in 1776, states as follows:

“ We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty, and the Pursuit of Happiness

It does not say all women, all men ect it says ALL Men which could be interpreted as all PEOPLE be they Male, Female ect are equal, thus meaning Gays have the same rights as anyone lese
If Gays, Lesbians, Transgender wish to marry each other, let them, what difference does it make