Methodology

Contribution window

We sum PAC contributions from the N quarters immediately before a roll-call vote date. N is defined per evidence case based on the relevant election cycle.

Delta formula

((current − prior) / prior) × 100, rounded to two decimal places. Returns no result if the prior period had zero or negative contributions.

What “industry” means

Industry codes come from OpenSecrets, which maps FEC contributor data to sector categories (e.g., Finance & Banking, Oil & Gas). One code per contribution record.

Limitations

Correlation only, not causation. Covers PAC contributions; does not include bundled donations or dark money. One election cycle per evidence case.