I don't buy into the weekend poll theory in the first place, especially for polls that weight by party ID (which includes, I think, the Washington Post poll we are talking about here). Democrats also have errands to run, things to do, places to go, etc.
In any event, when it comes to tracking polls, it is always a good idea to compare a daily result with the same result from a week ago to see if there has been any movement over the course of the week. If a week seems a bit too long, pick at least three days to make sure that none of the samples overlap.
In this case, the sample today shows that Bush gained a net of one point over Kerry over the last three days.
They have to leave messages in pumpkins.