Independently re-verified all three cited sources: each is real, live, and accurately quoted. Biden actively LED and drove this agenda far beyond a single vote, which is textbook CHAMPIONED: he signed the Inflation Reduction Act (2022), described by the White House as 'the most significant investment in U.S. history to tackle the climate crisis' (~$370B+ clean-energy tax credits, since spurring $450B+ private investment); directed EPA to finalize first-ever carbon standards on existing coal and new baseload gas plants requiring 90% carbon-pollution control (April 2024, confirmed verbatim on EPA.gov); funded grid/clean-energy buildout via the Bipartisan Infrastructure Law; rejoined the Paris Agreement; and formally set a 2035 NDC of 61-66% below 2005 levels 'on a straight line or steeper path to achieve net-zero greenhouse gas emissions, economy-wide, by no later than 2050' (confirmed on the archived White House fact sheet), while explicitly maintaining the 100% carbon-pollution-free-electricity-by-2035 goal. Not FULL: the two targets (2035 carbon-free grid, 2050 net-zero) are future dates that were not met; E&E News/Princeton's Jesse Jenkins project the grid reaching only ~two-thirds carbon-free by 2035 without major new policy, and Biden left office in January 2025. Not PARTIAL because neither of the specific promised end-states is close to achieved; the accurate characterization is leadership/driving of the effort. Cross-party fairness check: a politician of either party who enacted the largest law in their signature policy area, directed agency rulemaking to implement it, and set formal international targets, but left office before the long-term goal landed, would warrant CHAMPIONED under the same standard. Rating stands.