Obama is not falling in the polls

With every new poll that comes out there is a

Cenk mentioned a couple of times on today's show (8/1/08) that Obama has lost ground in OH, PA, and FL The best I can tell, this comes from the recent results of the Quinnipaic poll which showed that Obama has lost ground in each of those states from their last poll which was taken over a month ago.
We should not look at individual polls to determine a trend. There is always going to be sampling error (3-4% in national polls and 4-5% in state polls). Sampling errors in these polls are usually larger than the change in a candidate's support we see from poll to poll, so there is no way to conclude--from a single poll--whether their true support is going up or down.
A much better method for tracking trends is to average the results from many polls over time. This will wash out some of the sampling error and pollster bias if it exists. FiveThirtyEight and Pollster are two very good sites that do just that.
Now, I completely agree with his analysis of how Obama needs to make the debate about McCain and not play defense all of the time. I also agree that this race should be a blow out and most of the evidence so far says that it is a close race.
But let's get real about how this race is shaping up. There is no clear evidence that Obama is losing ground.
National Numbers: Before his foreign tour, when the media theme was Obama's flip-flopping, his numbers were slipping. Since his foreign visits Obama's numbers have stopped their decline and have begun trendnig upwards.
State Numbers: The following charts show how Obama's numbers have been trending in OH, FL, and PA.



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