All three prior sources are real, live, and on-point (GAO-25-106996 verified live; KFF explainer verified live; CMS fact sheet is a genuine page). But the FULL/0.8 rating overstates the literal promise. The promise was to REPEAL the law barring Medicare negotiation (the 2003 Part D non-interference clause). That clause was NOT repealed. KFF states the Inflation Reduction Act (signed Aug 2022) 'amends the non-interference clause by adding an exception' and that the clause 'fundamentally remains in place,' with negotiation limited to a small, phased carve-out: 10 drugs in 2026, 15 in 2027, 15 in 2028, 20/yr from 2029 — out of thousands, with orphan/plasma/low-spend drugs excluded. Biden unambiguously LED, sponsored, drove, and enacted the effort that pierced the ban for the highest-cost drugs, producing real negotiated prices (first 10 announced Aug 2024, effective 2026). That is the definition of CHAMPIONED (+0.75): actively led/drove and enacted a landmark measure that delivers the core intent. FULL ('essentially 100%' repeal) is not met because the statutory ban stands and covers the vast majority of drugs. Symmetry test: an opposite-party promise to 'repeal' a tax that instead raised the exemption so most payers are exempted (tax still on the books) would likewise grade CHAMPIONED, not FULL. PolitiFact rates the promise 'Promise Kept' reading it by intent, so FULL is a defensible alternate reading — hence confidence 0.7 rather than higher.