The problem is although the online polls are obviously bogus the MSM media always quotes them anyways during the morning news hours(and that will sway at last a couple on-the-fence voters). The following morning after the Edwards-Cheney debate there was a poll quoted on the CBS(I think it was CBS) morning news that said Edwards won by like 10 points. And it's absurd.
I heard today that right after the last Bush/Kerry debate, the polls said 14% thought Kerry won. After a week or so of media spin, a new poll said 80% now say he won. Perception is all that matters anymore to the masses.