One side says you cannot give gays and lesbians the right to marry and then take that right away. It is a matter of civil rights and equality for all.
On the other side, the anti-gay contingent, has few legal arguments, the primary one being that the people of California passed an initiative to ban gay marriage. Therefore, the will of the people must prevail.
This is the same argument that was used to resist Civil Rights for Black Americans in the early 1960s. All of which raises an interesting point: What does America do when the majority of Americans want something that is not fair or legal or even morally right? How do you reconcile democracy with ingrained prejudice? In this case, it is mixed up with religious fervor.
The current polls show that a majority of Americans now support gay marriage. That is true only until the Mormon Church spends millions of its dollars to influence public opinion on this or other political issues. Seems like a mingling of church and state policy. If churches become political action committees, shouldn't they lose their non-profit status? Once millions of dollars are spent on advertising by special interest groups like a tax-exempt church, the fickle public opinions change just enough to tweak the elections, even if it's temporarily. I bet that Prop 8 would not pass today in California, unless enough advertising was done to change public opinion for a month.
This issue is largely a generational gap, just like views on marijuana. Young people are mystified by the idea that gays shouldn't be allowed to marry. It's overtly absurd and harmful to their gay friends, who are a lot of fun to go out with. My daughters and other young Americans all have had openly gay friends; the older generation from WW2 has gay friends as well, but they are still hiding in the closet, so most of that generation are clueless about that reality in their ignorant bubble of false belief. In the Islamic Republic of Iran, where gay people are killed to purify the religious state, young gays are not so well known and/or accepted.
I predict that the Supreme Court will rule in favor of human rights for all people, including gays. This is truly a question of equal rights under American law. There is no real moral reason to exclude one group of people from certain inalienable rights. Soooo... just for the sake of discussion, let's make it illegal for fat people to marry. You don 't choose your sexual orientation, you are born with it. However, being fat is a choice. Makes more sense to me than banning gays. It would prevent more fat people from being born, right? Isn't that how it works? If I believe it is true, then it is!
Really, if gay folks want the right to marry, don't forget, you also get the right to suffer several divorces, as I have. Married life is not always a rainbow of fun. It can be utter misery as well, as can post-married life.
All kidding aside, every human being has a right to marry, regardless of sexual orientation, or race, or religion, or disability, or color of hair. Exclusion is prejudice. And this silly Republican mantra that "God made Adam and Eve, not Adam and Steve" is both lame and irrelevant. God made both Adam and Steve gay. So take it up with God.