Using the Silver-Zogby spat as a starting point, Jim Manzi details how "538 has created a real business model problem for pollsters":
Silver intelligently combines multiple polls to make more accurate predictions than are usually achieved by any one individual pollster. On one hand, the math of this is irresistible in the real world, voting models often work. On the other hand, it would be pretty uncomfortable for a pollster to combine his own results with various competitive poll results to achieve equivalent accuracy (or at least to do so transparently). So, the pollsters do all the tedious work to collect and analyze the data, and then Nate Silver comes along and creates all this value with it in a way that is hard for the pollsters to duplicate. You can see why this situation might upset the pollsters.
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