re: #179 gwangung

Margin of error is most meaningful for a single poll. If you’re taking multiple samplings, and the results are pretty much the same, then your confidence grows that the result actually reflects the population.

Now, the methodology is different from different polling outfits, but if you’re getting 5-7 outfits all getting the same results, you would be on solid ground to say that Obama has a narrow lead. You’d be on much less solid ground to say that this is tied.

i agree - for each poll that you add in to the average, the margin of error has to go down