DW-Nominate scores of congressional voting behavior regularly appears in media such as the [New York Times][1], [Washington Post][2], and [538][3]. This dataset contains the voting records used to generate those scores and additional features related to the DW-NOMINATE calculations. Content This dataset contains descriptive data as well as ideological data for congressional rollcalls, individual member votes, members of congress, and parties. You can find information such the descriptions of rollcalls, what proportion of voting members were correctly classified by the ideological cutting line for that rollcall, the ideological position of members of congress, and more. Both the rollcall data and the data on members are split into chambers and congresses. The data on parties is a dataset with some metadata about all of the different parties as well as their average ideological position and membership size broken down by congress and chamber. The full details behind the DW-NOMINATE calculations may be helpful in interpreting some of this data. The technical details of the DW-NOMINATE model can be found in Poole's Spatial Models of Parliamentary Voting. Poole and Rosenthal's Ideology and Congress explores the nature of voting in Congress and the political history of the United States through the lens of the ideological dimensions recovered by DW-NOMINATE. Acknowledgements This dataset was prepared by the team at [VoteView][4]. Please visit their site if you require up-to-date records. You may also be interested in [their blog][5]. Inspiration -Using national scores as a training set, can you develop polarization scores for you own state legislature? -Can you find correlates that help explain changes in DW-NOMINATE scores? [1]: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=newssearch&cd=2&cad=rja&uact=8&ved=0ahUKEwiIrsTXv83VAhVM2mMKHZaPAGQQqQIIKigAMAE&url=https%3A%2F%2Fwww.nytimes.com%2Finteractive%2F2017%2F07%2F13%2Fus%2Fpolitics%2Fsenate-revised-health-care-whip-count.html&usg=AFQjCNHrJZefX1YKXBvV2qFvTmcoK2HOfg [2]: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=newssearch&cd=2&cad=rja&uact=8&ved=0ahUKEwj37J6SwM3VAhUD0mMKHbCNAt8QqQIIKygAMAE&url=https%3A%2F%2Fwww.washingtonpost.com%2Fgraphics%2Fpolitics%2Fendangered-seats%2F&usg=AFQjCNFl_hrXqN7RWbTcMVg1f-YWqyuV3A [3]: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=newssearch&cd=1&cad=rja&uact=8&ved=0ahUKEwiIrsTXv83VAhVM2mMKHZaPAGQQqQIIJygAMAA&url=https%3A%2F%2Ffivethirtyeight.com%2Ffeatures%2Frepublican-senators-arent-embracing-trumps-transgender-military-ban%2F&usg=AFQjCNGW9fpdRKl-EoND8a1qmLOoGp24BQ [4]: https://voteview.com/data [5]: https://voteviewblog.com/