A CAMPAIGNER is a person who actively works to promote a cause, idea, or candidate. They often work on behalf of a political party or organization, and may be involved in activities such as canvassing, fundraising, and organizing rallies. A CAMPAIGNER on a trail is someone who is actively working to promote a cause, idea, or candidate while traveling from place to place. They may be visiting different cities or states to spread their message and gain support for their cause.