Modern Poltical Philosophy

Chris Bertram just put up a thoughtful post on ethical obligations to redistribute income and libertarianism. I like the post for, among other things, focusing on theories of my Contracts professor which I was unaware of. I expect the comment thread to get interesting, though it's been a while since a truly classic Crooked Timber comment thread in my opinion. I'd nominate the twin Steven Landsburg respone ones, though I'm quite open to the idea that there are more recent ones that I'm forgetting.