Final answer:
Individuals or groups campaigning for voting rights could be termed civil rights activists or part of public interest groups, with the 1965 Voting Rights Act being a pivotal law in such efforts in the U.S.
Step-by-step explanation:
The term for someone who campaigns for voting rights is not explicitly defined in the provided text, but based on historical context, such an individual or group could be referred to as a civil rights activist or a member of a public interest group. These individuals or groups engage in advocacy to ensure that all citizens have the opportunity to participate in the democratic process. Examples of this advocacy can be seen in the United States with the 1965 Voting Rights Act, which was a significant piece of legislation enacted to enforce the Fifteenth Amendment's prohibition against denying the right to vote based on race. This act authorized the federal government to oversee elections and intervene when necessary to protect voters' rights. Throughout history, many groups and individuals, like the Mississippi Freedom Democratic Party and civil rights organizations like the NAACP, have fought to overcome disenfranchisement and ensure suffrage for all.