It is a moderated blog - is your blog moderated? Charles has no desire to be a right-wing nut-job website - he wants people to be rational, polite, and informative. Im sure someone can go through the comments and cherry-pick something to negate my prior statement, but compared to the DIGG effect or the Kids at Kos, LGF is an open blog.
It's too bad the submitter decided to be cute and pass along his form of censorship in not using a left-leaning site to bolster his argument. The cutesy 'leave your smart remarks to yourself' is a weak attempt at humor, and smacks of the very attitude he/she rails against.
If you think genuine dissension is prevented, you must not have been reading the discussions about the social conservatives versus the GOP threads lately.