A while ago, I noticed that existing moderators were re-nominating themselves for elections. In other words, the system allows existing moderators to nominate in elections (even though they are already moderators).
In the first case I saw, it was a pro-tem election being held on a beta site: an existing pro-tem moderator had nominated in the election. In this particular case, they had nominated after receiving an email saying that they had to re-nominate (because the system assumes that the first election is after graduation, and at that point all existing moderators do in fact have to re-nominate), and they withdrew their nomination once it was clarified to them that the email wasn't correct.
This piqued my curiosity, though: Wikipedia allows its administrators to stand for a "reconfirmation" nomination, going through the same procedure as a new administrator wanting to gain the tools for the first time, with the provision that they will resign as an administrator should their nomination fail. The main reason an admin would want to do this is to see if they still have the same amount of community support that they once did.
Is this allowed for Stack Exchange moderators in moderator elections? Can an existing moderator run in an election (which does not already involve existing moderators being removed), with the provision that they will only continue moderating if they win the election and resign if they don't, or will their nomination be removed? To me, it would make sense if a moderator was considering resigning or had been a moderator for a long time, and wanted to see if they still have the community support they once had.