CHAMPIONED is upheld on documented leadership, at reduced confidence. Two reachable, reputable sources with VERBATIM quotes confirm that then-Rep. John Curtis (R-Utah) was the lead House author/sponsor of the PROVE IT Act (with Rep. Scott Peters) and chairs the Conservative Climate Caucus — the leading GOP vehicle for a carbon border adjustment. E&E News (source 1) frames him as a House "champion" of the carbon-tariff conversation and carries his verbatim rationale tying the bill to Europe's CBAM and America's carbon advantage; E&E News (source 2) verbatim confirms he introduced the House version. PROVE IT is the recognized foundational/precursor legislation for the China-carbon-tariff / foreign-pollution-fee agenda the promise describes, so leading it constitutes genuine, concrete championing of the "push," well beyond a mere vote. Confidence is lowered from the original 0.73 for three reasons: (1) the Niskanen Center quote as originally cited is NOT verbatim on the page — it is a paraphrase; I corrected it to the actual page text; (2) the leadership Curtis demonstrably provided is on a data/study bill that EXPLICITLY prohibits any carbon tax or fee and grants no tariff authority, i.e. a precursor one step removed from the literal promised instrument (a tariff); (3) the actual tariff vehicle (Foreign Pollution Fee Act, S.1325, led by Cassidy/Graham) is not law and Curtis's cosponsorship there is unverified. The rating correctly does not claim the tariff passed (that is why it is CHAMPIONED, not FULL). Not downgraded to UNRATABLE because leadership is real and two independent sources support it with accurate quotes; the one inaccurate quote is redundant (its substance is corroborated by a verbatim source).