history of 2-party US Senate
22 February 2008
a scatterplot timeline of the ebb-and-flow of party politics in the US Senate since the beginning of the modern (Democrat & Republican-dominated) 2-party era. the ideological measurements are based on the DW-NOMINATE algorithm, which take into account historical Senate Roll-Call votes.
the timeline conveys a sense of that shift by depicting the scaled left-right ideological positions of each Senator along the vertical axis. some of the patterns include the change in distance between the parties up until the mid-20th century, & a realignment in the late 1970s-early 1980s, where the polarization of the electorate & of elected officials became a dominant trend.
[link: duke.edu & princeton.edu & voteview.com & slate.com]
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