There seem to be two standard rules of political reporting when it comes to US presidential elections. One is that the media has a vested interest in a close race because that generates more interest in the news and thus more readers and viewers. Hence there is always more breathless reporting generated by positive news and polls favoring the candidate who is behind and negative news about the one who is ahead. So in the current race, where Donald Trump is behind, any poll that shows him close to or tied with Hillary Clinton gets wide coverage. But statistically, when two candidates are within three or four points of each other, there will always be some polls that show them to be tied or the one who is behind on average to be even ahead slightly, and the number of polls that show this in this race are what one might predict purely on statistics.
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