And in the US, the polls are a mere part of the media landscape, as accurate and honest as the journalists who report them. The latest CBS poll, for example, shows a 13 point advantage to the Democrats in its weighting. You believe that you believe anything, but nonetheless this bias does have an effect:
Anyone following the presidential campaign through the prism of media polls is doing themselves a serious disservice. Virtually every one uses a polling sample that is so heavily-skewed towards Democrats that it distorts the actual state of the campaign. Of course, that is a feature, not a bug of the polls. The polls are specifically designed to drive a narrative that Obama is surging and Romney is struggling. Increasingly, though, the polls are having to go to ridiculous efforts to support this meme. Friday’s CBS/New York Times poll, for example, uses a D+13 sample of registered voters. This is absurd. . . .
With a balanced partisan sample, Romney would likely post consistent leads against Obama. A week of this and Politico would run out of fuel for its daily ‘Romney is struggling’ theme. Which is why the media will never adjust its samples. This election, it isn’t so much about polling as propaganda. The polls are simply a tool being used by the media to try to depress GOP turnout and give a powerful lift to Obama’s obviously lackluster campaign.
The polls confirm that the media aren’t really biased. Rather, they are active players for the other team.