I'll second that, by and large. If you want to post on American blogs, get yourself an ultra-thick skin (everyone knows I've got one of those), and prepare to be surprised by the exceptionalism even of American lefties.

Honour where honour is due, though: I was generally well received on Digby's blog. Moon of Alabama (where I didn't post) seems very open too. But I don't post on US blogs any more. Apart from anything else, there's so much to do here.