4. Jesse Jackson (1984, 1988)
Jesse Jackson’s presidential campaigns in 1984 and 1988 introduced the “Rainbow Coalition,” uniting diverse groups—including African Americans, Hispanics, Asian Americans, Native Americans, and white progressives—to advocate for racial and economic equality. His 1984 campaign achieved historic milestones, winning five primaries and caucuses and securing over 3 million votes. Jackson’s efforts significantly increased minority voter registration and turnout, reshaping the Democratic Party’s approach to inclusivity. His influence is evident in the party’s subsequent embrace of diverse voices and progressive policies (history.com).