Without having specific details about this new national poll or the post-debate conventional wisdom it concerns, it’s not possible to give a fully informed response. However, depending on the context, it could mean that the poll’s results contradict or challenge what people generally expected or assumed would happen after a certain debate. These assumptions or expectations are often based on common trends, past events, or prevailing public opinions. If you provide more information, I may be able to offer a more detailed explanation.