I was going to reply to this and say what an interesting commentary it is on the entrenchedness of US political positions, that people are talking of a 55%-45% victory as a "landslide". That sounds actually like quite a close election to me, and I dug up some UK figures to provide a comparison -- only to find that even the landslides of 1987 (Tory) and 1997 (Labour) were only slightly more dramatic at 58%-42% (of those who voted for one of the two main parties).

Peter