Outcome CONFIRMED as CHAMPIONED; rationale and confidence revised. Independent re-check: all three cited sources are real, live, and directly support the rating. (1) The Senate Finance Committee release of Dec. 7, 2023 is authentic and headlined 'Wyden, Sullivan, Panetta, Carey Introduce Legislation to Improve Housing Affordability for Middle-Income Families' — establishing Sullivan as a named Senate co-author with Wyden, not a passive cosponsor. This verifies the promise's own premise. (2) Sullivan's official Senate site, dated 06.23.26, describes him as 'a leader in the Senate on working to increase the supply of affordable housing for middle- and low-income families and individuals,' 'notably through his Workforce Housing Tax Credit (WHTC) Act, which would establish the first-ever middle-income housing tax credit' — showing he was still driving the same effort ~2.5 years after introduction, not letting it lapse. That release also documents Senate passage of the 21st Century ROAD to Housing Act, which raises the cap on banks' public welfare investments 'including Housing Credits and Housing Bonds, from 15% of a bank's capital and surplus to 20%' and carries an Alaska-specific home repair pilot for the state's aging housing stock — i.e., real movement on both halves of the promise (housing tax credits and Alaska housing supply). (3) Multifamily Dive (May 11, 2026) independently confirms the 2023 bill 'died in committee' and that a House companion was reintroduced May 6, 2026. Rubric check: CHAMPIONED is defined as actively leading/sponsoring/driving the effort 'even if not fully enacted' — which is exactly this record. ATTEMPTED would understate authorship (it is reserved for advancing someone else's effort); PARTIAL (+0.5) and FULL are both wrong since the WHTC itself was never enacted and PARTIAL would be a downgrade on this scale. Symmetry test passed: Sen. Wyden (D) holds an identical role on this identical bill and would receive the same CHAMPIONED label, so the rating is not party-favorable. REVISIONS MADE: (a) stripped uncited assertions from the prior rationale that I could not substantiate with a live source — the claimed Alaska housing roundtable producing an AAHA/HUD Alaska Housing Task Force, the claim that permanent LIHTC expansion Sullivan backed passed in a 2025 reconciliation law, and the claim that WHTC was affirmatively 'left out' of that law; none of these were supported by the listed sources and they should not carry the weight of verified fact. (b) Flagging a factual error inside source 3: Multifamily Dive prints 'Sen. Dan Sullivan (R-Ark.)' — Sullivan represents Alaska, not Arkansas. The error is the publication's and does not affect the substance quoted. (c) Confidence raised 0.72 to 0.78 because both primary endpoints (2023 co-authorship, 2026 continued leadership) verified live; held below 0.85 because congress.gov and GovTrack returned HTTP 403 on direct fetch, so I could not independently confirm the official sponsor/cosponsor record for S.3436 or whether a Senate companion was reintroduced in the 119th Congress. That uncertainty affects nuance, not the outcome bucket.