1. The United States of America is a constitutional republic, not a democracy. California's proposition process is direct democracy. There are many California propositions that have been overturned by courts. "Majority rule" has historically been a poor form of government. The founders of The United States of America knew this, and created a constitutional republic.
2. Most Christians have no idea what "traditional marriage" means in the context of their own religion. Equating "traditional marriage" to "one man and one woman" is simply not historically accurate by the terms of the Christian religious texts, and only demonstrates the ignorance of the speaker. This is particularly true for the Mormon religion.
3. The influx of cash from supporters of Prop 8 from outside California (i.e., the Mormon Chruch) backfired. The passage of Prop 8 marked the start of a dramatic shift in public opinion about gay marriage. The passage of Prop 8 accelerated the social and legal shift towards gay marriage.
4. People who use slippery-slope arguments have no credibility in any debate.
5. For people who think that being gay is a choice … take a moment and open your mind, and think about the implications if you're wrong about that. What if it is an immutable characteristic? Because I'll tell you something … it is. No one chooses to be gay, or straight. But we're happy with who we are.
6. There is no "gay agenda." But gays do have one resource religions do not: Corporate America. Gay marriage is supported by leading Fortune 500 companies. Supporting employee diversity is a big deal. Gay employees demand it, and so do their straight allies. Not all companies are this progressive, but the better ones are, and desirable prospective employees know this.
7. The train has left the station. There is a generational shift in viewpoints at play with this issue, and those with bigoted viewpoints just need to die off.