Even though he did not win, the Presidents project, and the Notables as well, had been working on some of the nominees. He would be covered under the Notables project, and would still warrant a PPP from it, in fact. That said, it shouldn't be taken that it can't be edited if it is protected. You just want to make sure to discuss major changes with the project. Adding categories, sources, helping write bios if there isn't one-those are all things that can happen without worrying about project contact. Adding family, changing names, major edits to existing bios-those do tend to be better done after touching base with the project to make sure there wasn't a reason for it to be the way it is.