Independently verified. Congress.gov and GovInfo confirm Sen. Sheldon Whitehouse (D-RI) is the lead sponsor of S.4355 (117th Congress), the Clean Competition Act, introduced June 2022, which amends the Internal Revenue Code to create a carbon border adjustment based on carbon intensity, cosponsored by Coons, Schatz, and Heinrich. His Senate office press release (live) confirms the introduction and its stated purpose of boosting domestic manufacturers while cutting emissions. He did not merely introduce it once: he reintroduced it as S.3422 (118th Congress) with Rep. DelBene on Dec 6, 2023 (Senate press release and EPW committee release both live), sustaining and leading the effort. The bill has never been enacted, so this is not FULL, but Whitehouse authored, sponsored, reintroduced, and publicly advocated the measure — well beyond a single supporting vote — which is CHAMPIONED (+0.75). Fairness check: a legislator of any party who is the named lead sponsor introducing and reintroducing a signature bill across multiple Congresses would receive the same CHAMPIONED label; no partisan leniency detected. All three sources in the prior rating are real and accurately quoted. Confidence 0.9 retained.