"Be a candidate" is a common phrase used to describe someone who is running for a position in an election or seeking a job opportunity. However, there are many synonyms for this phrase that can help to add variety and depth to your writing. Some alternative phrases include: run for office, seek election, vie for candidacy, stand for nomination, be in the running, put oneself forward, apply for candidacy, and declare oneself a candidate. Each of these phrases offers a slightly different connotation, so it's important to choose the one that best fits the context in which it is being used.