On January 27th, the Cambridge (U.K.) Union Society debated "This house believes in the spread of Western liberal democracy, by force where necessary." Writer/blogger Norm Geras -- a Marxist who I've quoted and concurred with often before -- was among those speaking in favor of the proposition.
Geras reprints his text here. I recommend its sanity and syllogism, even though his approach is narrower than I've often endorsed.
Unsurprisingly, the motion was defeated by a ratio of about two to one.