No, carpetbagging is something else. Check it out at Wikipedia
Basically, that's someone who moves somewhere else to take advantage of the situation there. Now, we use it for a politician who moves to a district he's not from because he has a good chance of getting elected from that district. A carpetbagger doesn't intend to scam you, but will take advantage (perhaps unfair advantage) of what is in the place he moves to.
Originally, a shell company came to mind, but that's not right either.
I think the above-mentioned fly-by-night is as good as we'll get on this one.