Antonyms for the word "campaigned against" may include "supported," "endorsed," "backed," "favored," or "championed." These words indicate that an individual or group is actively promoting or advocating for a particular cause or person, rather than working against it. While "campaigned against" suggests opposition or hostility, these antonyms convey a positive stance or attitude towards the subject of the campaign. In political contexts, antonyms for "campaigned against" are particularly relevant, as politicians often jockey for endorsements from influential leaders and interest groups to boost their chances of success at the polls.