They can't have Biden claim victory, he'll never be able to appear in public after that point.
Q+ wouldn't have used "Bidan" for no reason.
If that hypothetical is true (be it body double or clone), you have to wonder where exactly Biden went? You'd assume that as soon as a double gets thrown into the picture, it has nothing to do with DS plans, otherwise they would bring in replacements.
Wonder who owned NK all this time.