The concept is deceptively simple: political and religious expression/speech is legally protected in many jurisdictions around the world.
There are two facets of the feature that mutually protect each other:
1. The ability to guarantee freedom of speech by hosting it on the block chain;
2. Possibly more importantly, protection of the block chain by having expressions of protected speech embedded in it.
What do you think of the idea of having JD take random lines from its on-site chat as its "CLAMspeech" for the blocks it stakes?
That way you get a much wider range of "expression" in the blockchain - though some of it may not be the kind of stuff you want preserved forever.
I've asked before and don't think I've seen an answer: are the "expression of * freedom: *" lines a work in progress? Are they templates to be filled in with real statements about each religion/whatever? Because it seems to me that currently the "expressions" aren't actually expressing anything - they're just a list of religions and suchlike.