These tracking polls are going to be up and down for a while still. With the debates upcoming, we'll see some swings, I think.
Should we discount the polls? I don't think so, but I think we need to watch for trends rather than base anything on one day's polling.
Of course, the only poll that really matters is the one on November 2.
Wish someone with the time could post all the polls on Monday night before the election and see how accurate they end up being.