correction yes he is a reputable commentator but his unpublished essays are not reliable sources in the sense that his academic publications are second he's is this field a general political commentator not an academic and makes no pretense and being unbiased of course everyone who writes on this subject is probably biased somewhat perhaps we can quote him after all if we make it clear it's an essay but i'd still hope for better sources incidentally if anyone is interested i think his wikipedia bio needs some work in the direction of objectivity and rewriting the parts copied directly from his web site