There has been one copyright extension that can reasonably blamed on Disney lobbying.
There was one other that also affected Disney's copyright terms, but I can't find any evidence that Disney did any lobbying for that one, and even if they did it wouldn't have made a difference because that one had near universal support anyway because it was part of a major rewrite of US copyright law that did the most of the heavy lifting to make it feasible for the US to join the Berne Convention.
There was one other that also affected Disney's copyright terms, but I can't find any evidence that Disney did any lobbying for that one, and even if they did it wouldn't have made a difference because that one had near universal support anyway because it was part of a major rewrite of US copyright law that did the most of the heavy lifting to make it feasible for the US to join the Berne Convention.