Campaign research questions are generally on topic as long as they are acceptable questions according to other site critera, though we should suggest asking in more appropriate SEs in cases where it is probably better.
Interestingly, I was a major opponent of campaign research questions in the original discussion, but I have come around and disagree with the majority of the "let's ban them" reasoning. here's the deal. To ban a kind of question as a "site rule," it needs to present a clear and present danger to the site. Anything else should go under normal site voting rules. So let's evaluate.