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Tuesday, September 25, 2012
This year it has been widely noticed that the Gallup tracking poll looks much better for Romney than any other national poll except Rasmussen. Steve Singiser at Daily Kos has been reporting graphs of the two trackers and non trackers separately for a long time.
The ever calm Josh Marshall mentioned it today
It's the talk of the web. This makes 2012 just like 2008, 2004 and 2000. I posted on the *return* of the Gallup anomaly on May 11 2004.
In fact googling gallup anomaly site:rjwaldmann.blogspot.com gives 71 hits.
Many of them focus on the Gallup likely voter filter which is irrelevant to the current Gallup anomaly, since Gallup is still reporting results for registered voters (and yet has a Romney house effect !).
The odd thing is that Gallup remains the most respected name in polling even after all these anomalies, while Rasmussen is considered a joke.
I think that, this year, the explanation is pretty clear -- Gallup assumes low African American turnout based on 2010 when others base on 2008 or allow the sample to be the sample without weighting. But I don't remember where I read that. I just quote Marshall
"Less clear is Gallup. They don’t have any obviously ideological bias. And they do use cell phones in their surveys. The issue seems to be giving more credence to a 2010 model of the electorate than a 2008 one."
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