Files for Classroom Presentations
- 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
More Fun with Vote View Data
- 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
Idaho Party Registration Over Time
- Idaho Party Registration Data File (Excel)
- Idaho Party Registration Data File (Excel Tidy)
Idaho Party Registration 2012 to 2026
Republican
Democratic
Unaffiliated
Libertarian
Constitution
Stacked area shows proportional share. Republicans grew from 26% to 61% while unaffiliated voters dropped from 69% to 25%.
Republican
Democratic
Unaffiliated
Libertarian
Constitution
Total registrations peaked near 1.07M in 2024. Republican registrations more than tripled over the period.
Republican
Democratic
Unaffiliated
Libertarian
Net change between measurement years. The 2016 cycle saw enormous Republican growth (+152K) alongside unaffiliated collapse (−114K).
Republican gain
+426K
2012 → 2026
Unaffiliated loss
−290K
2012 → 2026
Democratic gain
+82K
peaked 2020, now declining
GOP share 2026
61.5%
up from 25.5% in 2012
| Party | 2012 | 2016 | 2020 | 2024 | 2026 | Total Δ |
|---|