There are no conflicts of interest beyond those in niche markets anywhere. There are a finite number of people and companies serving in this space. Multiple campaigns use the same contractors, and those contractors will advise campaigns. The conflict of interest is known and the key thing is declaring them, siloing information, and policing behavior. This happens in every startup board where a customer participates in a funding round [and gets board seats].
Also, what was DHS going to do here? This is a private organization doing a [private] caucus in a single state. We've all read the mythical man month. DHS should focus on securing the national elections, which there is ample evidence they are behind on.