CHAMPIONED is upheld. Two reachable PRIMARY .gov sources independently confirm that Gillibrand LEADS (not merely supports) legislation targeting the exact "better keep up with inflation" mechanism in the promise. Gillibrand's own Senate office states the Boosting Benefits and COLAs for Seniors Act is the bill "which Senator Gillibrand leads" and is "co-led by" Blumenthal, Gallego, and Budzinski; it changes the annual COLA formula from CPI-W to the seniors-specific CPI-E. Gallego's office corroborates her as a co-introducer of the same bicameral bill. She is also a cosponsor of the Social Security Expansion Act (S.770), confirming a broader pattern of pushing benefit expansion. Because the promise is a "push to" (advocacy) commitment, her demonstrated co-leadership/authorship of the effort satisfies CHAMPIONED even though none of these minority-party bills has been enacted and no expanded benefit has yet reached beneficiaries — the rationale correctly caveats this. Verification notes: Source 1's cited quote is verbatim in its first clause but its tail ("shifting from the CPI-W index to the CPI-E index") is an accurate paraphrase rather than on-page text; Source 3 (congress.gov) is blocked to automated fetching (403 bot-block, not a dead/incorrect URL) but its cited cosponsor sentence was independently confirmed verbatim via web search. These minor issues lower confidence slightly from 0.9 but do not undermine the outcome.