Plus they are easily duped by the media that runs these polls. When was the last time any one called and asked YOUR opinion? I know I have never been called and I have been a registered voter for 24 years.
I was recently called and the participated in order to learn how the questions are posed. Near the beginning was "Is the country on the right track or the wrong track" I told the interviewer that I needed a bit more clarification before I could give her an answer. She asked me what I meant, and I said, Are you asking about the economy, the war on Terror, the border issues, pop culture...
I passed on that question, because it is meaningless, yet used by all the pundits to claim anything they want it to mean.