carpetbaggers

(history) An immigrant from the Northern to the Southern States after the American Civil War of 1861–5, especially one who went South to gain political influence.

(by extension) One who comes to a place or organisation with which they have no previous connection with the sole or primary aim of personal gain, especially political or financial gain.

“He's just a carpetbagger who was surprised to find that Southerns are not like the cast of “The Dukes of Hazzard” or “Deliverance”.”