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election-data-source-countypres

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County Presidential Returns 2000-2024 (MIT MEDSL). Vote shares, party trends, turnout by county_fips (joins census/education data). Requires HARVARD_DATAVERSE_API_KEY. Critical: mode='TOTAL' drops ~1K counties post-2020 — use 3-pattern reconstruction

When to use

• County-level presidential vote shares
• Party trends
• Turnout analysis
• Geographic voting patterns
• Joining with census data
• Joining with education data
• Voting method analysis for 2020 and 2024

When not to use

• Non-presidential election data
• State-level aggregate analysis without county detail

Skill page

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