What it measures
PAC is contributions from other political committees ÷ total contributions, straight from FEC committee totals.
By the numbers
| Measure | Value | Source |
|---|---|---|
| PAC share of all House candidates’ receipts, 2003–04 | 37% | Campaign Finance Institute, Table 2-8 (House receipts by source) |
| Same, 2015–16 | 39% | Campaign Finance Institute, Table 2-8 (House receipts by source) |
| Same, 2017–18 | 27% | Campaign Finance Institute, Table 2-8 (House receipts by source) |
| 2020s cycles | data needed | not yet sourced |
CFI’s denominator is total receipts; ours is total contributions, so card values run a bit higher. Full formula: Methodology.