Gay marriage should not be legalized, for many reasons. One, it is immoral and is banned in most major religions. Second, it is unnatural. A family must consist of one man and one woman to carry out their respective motherly and fatherly roles. A same sex couple can not use this universal rule of marriage, and can definitely not raise adopted children the same way biological children of opposite sex couples are raised. Third, if gay marriage is legalized in the United States, think of the repercussions... the people will then start demanding legalization of other unnatural and immoral forms of marriages and sexual relationships, such as polygamy and sodomy.
Sorry!! Can I state my opinion still? Definitions cannot change. Marriage is a special bond between a man and a woman. A new term must be coined for gays to get a civil contract showing they are together of some sort. Anyways, in the State of Nature man is man, woman is woman. Naturally a man and woman go together. If it was okay to be gay then gays would be able to reproduce too, but they can't so obviously it is immoral. Being gay is also a choice. In fact if one wanted to be straight when they are gay they can undergo rehabilitation just like an alcoholic does.