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Tomorrow (Tuesday November 6th) is election day in the US. The talk of the pundits generally focuses on the fact that this is a very close election and, despite rhetoric from both candidates about bipartisanship, the country seems to be extremely politically polarized. The consensus of opinion is that Democrats and Republicans over the last couple of decades have become more homogeneous, more tribal, and more extreme. (Meanwhile the number of people who identify as independents has increased.)