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Why is Ann Selzer such a good pollster?
The Des Moinez Register comes out tomorrow with the final poll before Monday's caucus.
This poll generally does the best job at picking the winners and the margins.
Why is Ann so good at this?
Here is a good (long) story about her. Yes, it's from 538. But, no, Nate didn't write it.
http://fivethirtyeight.com/features/selzer/