This is another sad obstacle. Here the team or organisation is undermined by internal conflict. Sadly this can be a problem especially in small NGOs, but it does undermine effective campaigning. Clearly this disharmony needs to be tackled before the campaigning can take off. This disharmony just has to be tackled and not avoided. You just cannot build a successful campaign on such a platform, or if you are able to do so why you adding to your own stress and diverting energy from your campaign?
You do need a united team for effective advocacy campaigns. This has to be the primary goal before you can even consider running an advocacy campaign.