This is what the Trump campaign has done, although the "not coordinate" part is doubtful since Donald Trump talks to Musk, one of his outsourcers (outsourcerers?) multiple times a week. As long as they just discuss golf and how Melania is taking the campaign and who she will vote for, it is probably OK. If they get into politics, maybe no so OK. In any event, as we have also pointed out a couple of times, while Musk does know a lot about making electric cars and firing rockets into space (and catching them on the way down), he doesn't know much about running a GOTV operation, and it is starting to show.