Almost all campaigns need a local part that is absolutely vital for its success. For instance, if you want to address a German party, your chances are much better if you do that as a German citizen. Want to write a letter to a French ministry? Better find some French guys to do that. The closer your are to the target, the more effective you are. Also in the USA, what do you think will impress people more? Criticism by your own citizens, or criticism by some people far, far away?

There's an old saw which seems to apply perfectly here: Think global, act local.