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What polling errors from recent elections can tell us about 2016's closest Senate races

As Election Day approaches, the volume of polling has increased. It’s easy for any individual poll to be wrong for a variety of reasons. However, we can reduce the chance for error from any single poll by combining it with many other polls in a statistical average, which is just what Huffington Post Pollster and Daily Kos Elections do. These averages are essential for giving us the lay of the land in key races, like those that could determine which party controls the Senate in 2016.
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