Simple R-Based Polarization Density Visualization
- Polarization of 117th Congress R File for POLS 300
- DW-Nominate Scores for the 80th Congress (From Legacy Site)
- DW-Nominate Scores for the 117th Congress
- DW-Nominate Scores for 80th to 112th Congress
Changes in Individual Partisanship Over Time
- Data from the 84th through the 119th Congress (as of 03/20/2026)
DW-NOMINATE Ideology Explorer — Congresses 84–119 (1955–2025)
Congress A:
Congress B:
Chamber:
Members compared
--
in both congresses
Avg Dem shift
--
Nokken-Poole dim1
Avg Rep shift
--
Nokken-Poole dim1
Biggest mover
--
--
Democrat
Republican
Other
Senate (ring)
Source: VoteView.com — Nokken-Poole first dimension ideal point scores. Data: GitHub