There's a difference between wanting one candidate to win and purposely biasing your facts. There are lots of different polls out there, if the guy who supports Kerry really were biased, he'd have no reason not to go scrounge around for random polls with Kerry ahead and paste them all together to make it seem like Kerry will undoubtedly win, but he hasn't. I know that I've seen many polls differing greatly on national and state-wide numbers, and if anyone put a concerted effort into it, they could go around and find random polls that would show their guy winning in a landslide.
Just chill out and wait a bit, Iraq is turbulent, the debates (which are more like mutual press conferences) are coming up, there're always going to be "October Surprises", just wait a while before you go proclaiming Bush the winner. I think a telling sign that the race is close is that not even official Bush representatives on TV are willing to say anything like "Kerry's through", they all caution people that it will be a close race.