The promise was itself the act of cosponsoring S.J.Res.13, a constitutional balanced budget amendment. Primary records confirm Britt did exactly that. Her own Senate office page states she "has joined U.S. Senator Cindy Hyde-Smith (R-Miss.), along with 22 additional Senate cosponsors" in introducing S.J.Res.13, which would "Require the President to submit a balanced budget and Congress to pass a balanced budget." Lead sponsor Cindy Hyde-Smith's Senate office independently confirms Britt "joined U.S. Senator Cindy Hyde-Smith and 22 additional Senate cosponsors in introducing a balanced budget amendment to the U.S. Constitution." Both quotes in the rating were verified verbatim against the reachable pages. The third cited source (Congress.gov cosponsor list) returned HTTP 403 to automated fetch, but its content was independently corroborated by web search, which lists Katie Britt (R-Ala.) among the original cosponsors of S.J.Res.13 (118th Congress). She did precisely what was promised, so FULL is correct. It is correctly NOT CHAMPIONED: Britt was one of 23 cosponsors, not the lead sponsor/author (Hyde-Smith led the effort), and there is no evidence she authored or drove the resolution beyond adding her name. The promise was the act of cosponsoring, not enactment of a balanced budget, and that act is fully documented.