The British Tory leader makes the truly conservative case about civil marriage in his party conference speech yesterday:
There's something special about marriage. It's not about religion. It's not about morality. It's about commitment.
When you stand up there, in front of your friends and your family, in front of the world, whether it's in a church or anywhere else, what you're doing really means something.
Pledging yourself to another means doing something brave and important. You are making a commitment. You are publicly saying: it's not just about me, me me anymore. It is about we - together, the two of us, through thick and thin.
That really matters.
And by the way, it means something whether you're a man and a woman, a woman and a woman or a man and another man. That's why we were right to support civil partnerships, and I'm proud of that.
Cameron is also a backer of environmentalism as a conservative calling:
If you want to understand climate change, go and see Al Gore's film, An Inconvenient Truth.
Today, I want to tell the British people some uncomfortable truths. There is a price for progress in tackling climate change. Yes of course low-energy lightbulbs, hybrid cars - even a windmill on your roof…can make a difference and also save money.
But these things are not enough. Government must show leadership by setting the right framework. Binding targets for carbon reduction, year on year. That would create a price for carbon in our economy.
What does that mean?
It means that things which produce more carbon will get more expensive. Going green is not some fashionable, pain-free option. It will place a responsibility on business. It will place a responsibility on all of us.
That is the point.
Tackling climate change is our social responsibility - to the next generation.
Isn't it refreshing to hear a conservatism that isn't riddled with prejudice, unreason, and religious zeal? Isn't it a relief to hear a conservative actually asking people to sacrifice something for the next generation, instead of stealing from them? Isn't it encouraging to see a conservative leader actually treat gay people as human beings rather than political pawns?