Campaigning for is a commonly used phrase to describe the act of promoting or advocating for a particular cause or candidate. However, there are many synonyms that can be used to convey the same message including supporting, pushing for, championing, advocating, promoting, fighting for, backing, vouching for, lobbying for, and endorsing. Using different synonyms can add variety and depth to your writing, and can make your message more impactful and memorable to your audience. It is important to consider the tone and context of your writing when selecting synonyms, as some words may carry stronger connotations than others.