It's only a three day poll, not a four day poll as I origianlly said. Kerry's excellent Saturday drops off tomorrow.
The Washington Post tracking poll will be conducted daily until Election Day. The latest tracking result represents the four-night average of data collected by telephone Oct 22 - 25 among a randomly selected national sample of 2,414 adults, including 2,084 self-identified registered voters and 1,666 likely voters. The Post and ABC News collect data jointly but are responsible for developing their own methods to identify likely voters. This may produce slightly different estimates of candidate support. The margin of sampling error for results based on these three groups is plus or minus 3 percentage points, and slightly larger for subsamples. Sampling error is only one of many potential sources of error in this or any other public opinion poll. Interviewing was conducted by TNS of Horsham, Pa