Cook Political Report and Sabato's Crystal Ball ratings. Each state is colored by its most competitive race.
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Independent expenditures by PACs, super PACs, and other outside groups — money the candidate does not control, often funding attack ads. Distinct from candidate fundraising shown on race pages.
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How well race data has been cross-checked across independent sources (House Clerk, GovTrack, FEC). Green = all confirmed. Yellow = minor discrepancies. Red = significant disagreement.