A common belief is that open primaries reduce political extremism by electing moderates.
Data & Methods
We analyze a unique dataset combining state legislator ideal points with detailed primary system information across U.S. states.
Key Findings
- Open primaries have minimal impact on the ideology of elected officials.
- The effect of nomination systems on producing moderate politicians is negligible.
- Legislators' ideological leanings remain largely unaffected by whether voters include nonparty members in primaries.
Why It Matters
This suggests primary system reforms may not effectively address polarization concerns, prompting a rethink about other strategies for achieving more centrist representation.
