Marion Sanders holds a prestigious educational background, graduating from the Horace Mann School and Wellesley College, where she received the Alumnae Achievement Award. She furthered her education at Columbia University Graduate School of Journalism and edited the Wellesley College yearbook. Professionally, Sanders began her career as a freelance journalist and political speechwriter, transitioning to public relations roles at the Roxy Theater and Gaumont British Picture Corp. She later served in various public relations and educational capacities for the Port of New York Authority, producing extensive educational content and media. During World War II, she worked with the Office of War Information and later managed international press and publications for the Office of International Information. Sanders' career culminated in editorial roles at Harper's Magazine and World Press Review, and she authored several books, including a biography of Dorothy Thompson.

Marion Sanders's political identity is shaped by a blend of progressive advocacy and strategic communication. Her career as a journalist and public relations director reveals a knack for framing complex issues in accessible ways. Sanders's support for women's rights and social welfare juxtaposes with her involvement in international information programs, suggesting a nuanced approach to global and local issues. Her work with refugee aid organizations highlights a humanitarian streak, while her extensive media experience indicates a calculated use of rhetoric to influence public opinion. This combination of roles creates a politician whose ideological stances are as multifaceted as her professional background.