Joyner actively participated in political campaigns, supporting candidates who championed civil rights and equality. She recognized the importance of political representation and used her influence to promote positive change.

Joyner served as an advisor to the Democratic National Committee, advocating for the needs and concerns of the African American community. Her involvement in the political arena helped shape policy and influence decision-making.

Marjorie Joyner encouraged voter registration drives, in order to encourage the population to vote.