Agreement Groups in the United States Senate "Being interested in social networks and communities, it was only natural to look at how those Senators were linked one to another and the natural community structure which emerged from their interactions. Thanks to GovTrack.us, we were able to construct for each session of the Senate an agreement graph between Senators. We then clustered the Senators into overlapping groups of agreement using a new community detection algorithm called C3 which attempts to find maximally cohesive groups in the network"
This new algorithm isn't perfect so it's worth reading the discussion below the chart on the site. E.g., "One unexplicable point remains in the data and that is the presence of 18 Democrats in the Republican group of the 108th Congress. We'd be happy to complete this discussion with some ideas of how to clarify this grouping but we haven't been able to find any political explanation."
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