Independently verified against live primary sources. Maria Cantwell was one of four lead co-introducers (with Wyden, Manchin, and Feinstein) of the National Prescribed Fire Act of 2021 (S.1734), introduced May 20, 2021. She issued her own championing statement that the bill 'more than doubles the funding for controlled burns to reduce hazardous wildfire fuels and addresses the cumbersome requirements to burn outside the fire season' — an active leadership role well beyond a single supporting vote, which is the definition of CHAMPIONED (+0.75). The named Act itself stalled: it was referred to the Senate Energy and Natural Resources Committee, never received a vote, and did not become law before the 117th Congress ended. Cantwell separately voted for the Bipartisan Infrastructure Law (Nov 2021), which delivered substantial hazardous-fuels and wildfire-risk funding (roughly $1.7B for fuels management; $3.5B additional to the Forest Service), partially advancing the funding goal though not the off-season-burning reforms. Adversarial fairness check: a senator of either party with this exact record (lead co-introducer + public championing + bill dies in committee) would earn CHAMPIONED under the same standard; the label is neither lenient nor harsh. FULL/PARTIAL are inapplicable because the promise's vehicle was never enacted, and ATTEMPTED would understate her lead-sponsor role. Prior rating's third source (a cantwell.senate.gov infrastructure quote) could not be independently confirmed and is replaced here with the live-verified Wyden press release and the Congress.gov status page; outcome and confidence stand.