All three cited sources are reachable and substantively support the FULL rating. The promise is about Daines's own act of signing onto and backing a constitutional amendment limiting congressional terms — not the amendment's enactment (which requires 2/3 + state ratification and has not occurred), so FULL is not overstated. Source 1 (daines.senate.gov, Jan 7, 2015 — the promise date) is PRIMARY and confirms he joined Vitter in introducing S.J.Res.1, a constitutional amendment for term limits; the cited quote appears verbatim. Source 2 (daines.senate.gov, Jan 10, 2019) is PRIMARY and documents continued backing of the amendment; the cited quote appears verbatim. Source 3 (U.S. Term Limits) is a REPUTABLE_SECONDARY corroborator confirming he cosponsored SJR1 and signed the three-House/two-Senate-term pledge; the rating's quote is a stitched paraphrase joined by an ellipsis (and 'He' substituted for 'Daines'), but the key phrases appear on the page and nothing is fabricated. He acted as a repeat cosponsor/advocate rather than lead sponsor, so FULL (not CHAMPIONED) is the correct tier. No grounds to downgrade.