Sabotage doesn't mean damage, it means to use underhanded methods or surreptitious methods to interfere with something. "Seat sabotage" woud mean that one or more parties or individuals are doing something underhanded to interfere with the election of certain parties to seats in Parliament. , In hopes of capturing the ABC seat, XYZ party is dropping leaflets from planes in certain underprivileged areas in that district that accuse the opposition party's candidate of nefarious dealings, although those allegations have long been discredited.
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