I'm reading the replies here and I get the feeling that I'm missing something fundamental--and it's really only Chipmixer that I'm referring to.

Those two ideas above: Wouldn't anything Chipmixer gave DarkStar_ that hasn't been paid out consider kind of tainted by any of those agencies I mentioned in my previous post?  In other words, if DarkStar_ donated leftover campaign funds (and that's what I think I'm confused about) to bitcointalk, would that not potentially pose a legal problem down the line?