It's not FDIC insured I know. It will be hard for them to take your funds and go? It's an exchange! and in the US. Unless, they say it was hacked? That's what I think. Nothing to panic as of yet.
It's not hard at all. The fact is they have already taken your funds with your consent of course. And maybe they have gone too, considering that withdrawals are not being done. If you had deposited USD with them MAYBE there is some limited recourse via the banking system, but these usually have a short time period (e.g. "stop payment" on a check). If you have mined or otherwise acquired BTC, exchanged it to USD, and are holding a USD "deposit" with CampBX, you are completely at the mercy of a couple of individuals who have not displayed themselves as trustworthy at all.
It's only an "exchange" because it says so. Being in the US has nothing to do with its legitimacy.
Don't get me wrong, I don't wish trouble for anyone and I sincerely hope that everybody who has cash at CampBX will be able to get it out. I'm just surprised that after hundreds upon hundreds of documented bitcoin-related scams, thefts, hacks, and other misfortunes we are still willing to favor blind trust over facts.