looking at gallup.com it says that Obama is at 49% while McCain is at 43% as of now,but in mid september they were even

The Virginia Senate Race looks to be leaning Democratic. As of Thursday October 9th, Warner 58% and Gilmore31%, putting Warner up 27 points.

I think that polling does have alot of impact on modern voting but at the same time i think that could be somewhat inacruate and cause misleading leads for the candates. Like Obama is doin well in the polls and he is starting to get cocky. The election isnt over till everyone votes. I think that for the people they poll it has good information reguarding there opinions but there is still many people that they do not poll.