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I agree that the Clinton campaign probably chose the "Hanging Rock" context for a reason, but I suspect it was not a comment on the precarious state of her candidacy. Rather, they were probably attempting to prime the association with our national situation--we are hanging on the edge in terms of physical and economic security. The overuse of the word "Safe" is probably a Mark Penn tested way to enhance the subtext.
Yes, this really is the way marketers think and operate...