Originally Posted by DJ's left nut
Some do, some don't.
Pollsters can, and often do (especially when trying to make projections based on their believed electorate), filter through results and/or drop randomly selected samples if they don't fit the projection model.
The guys that are trying to really predict will absolutely tailor their sample to fit a projected voter pattern, otherwise it's just random chance.
I heard something yesterday that was interesting...and probably germaine to the 'conservative media lied to you' subject about polls that broke down not between democrat, republican and independent but rather polls between liberal, moderate and conservative. Post election that was the first time I had ever heard of such poll and it told the story exactly.
Conservatives clearly lost out to the moderate/liberal. I think that would have been a better way to evaluate the pre-election polls. Had I known of those polls pre-election I may not have waited an hour in line to vote since there was no point.