Antonyms for the phrase "campaigning against" include: supporting, promoting, advocating for, championing, backing, and endorsing. These antonyms suggest positive actions and support towards a particular cause or individual, rather than opposition or criticism. Supporting a cause, for example, involves providing encouragement and resources to help it succeed, whereas campaigning against it involves taking action to prevent its success. Similarly, promoting someone involves highlighting their positive qualities and achievements, while campaigning against them involves criticizing and undermining them. By using antonyms to "campaigning against," we can shift our focus towards positive actions and promoting change in a constructive and supportive manner.