Both cited sources were fetched and verify the rating. The PRIMARY source (Governor Reeves's official office) documents THIS promise's outcome verbatim: HB 1 "cuts the individual income tax rate to 3% by calendar year 2030, with future annual decreases until it ultimately falls to 0%" — exactly the phase-to-zero mechanism promised — and contains verbatim the leadership quote "From my days as lieutenant governor to my first campaign for this office – and every legislative session since – I have made this my mission." The REPUTABLE_SECONDARY source (WLBT) confirms Reeves signed HB 1 (article dated March 27, 2025) with the verbatim fragment "The passage of HB 1 is a day to celebrate finally ending Mississippi's tax on work" and confirms the "eventual elimination of the income tax." On the CHAMPIONED leadership test: a governor's leadership manifests as proposing, campaigning, and signing (not voting), and the sources show more than mere support — his self-attributed multi-year ownership plus signing the enacting signature bill. CHAMPIONED (not FULL) is correct because the tax is not yet zero: the rate only reaches 3% in 2030 and final reductions to 0% extend over a decade-plus contingent on revenue-growth triggers. Confidence is trimmed from 0.9 to 0.85 because the strongest leadership evidence is self-attributed in the governor's own press release, and the independent WLBT source foregrounds the legislature (Speaker White "reached the finish line") as much as the governor; also the second/third segments of the WLBT citation are lightly paraphrased/stitched with ellipses, though the load-bearing fragment and the substance are verbatim-accurate. Sources reachable, outcome supported, quotes not fabricated.