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"British polls are properly and carefully weighted, taking account of what is known as the spiral of silence the tendency of voters for the less fashionable party to keep their intentions to themselves. British pollsters weight their results to allow for these shy voters. US pollsters do not."
"It isnt unreasonable to believe that there could be a Republican spiral of silence. And that US pollsters are all missing it."
This comes out of the British pollsters total meltdown in 1992, when they ALL got it badly wrong.
Living in Britain at the time, I remember laughing my @$# off. :-)