The Rev. Jesse Louis Jackson, the towering civil rights leader whose moral vision and fiery oratory reshaped the Democratic Party and America, has died, his son said. He was 84.

Jackson, a protégé of the Rev. Martin Luther King Jr., had been hospitalized in recent months and was under observation for progressive supranuclear palsy. He died Tuesday morning, surrounded by his family, according to a statement from his nonprofit social justice organization, the Rainbow PUSH Coalition.

“His unwavering commitment to justice, equality, and human rights helped shape a global movement for freedom and dignity. A tireless change agent, he elevated the voices of the voiceless – from his Presidential campaigns in the 1980s to mobilizing millions to register to vote – leaving an indelible mark on history,” the statement read.

Jackson was what one pundit called “an American original.” He was born to an unwed teenage mom in Greenville, South Carolina, during the Jim Crow era but rose to become a civil rights icon and a groundbreaking politician who mounted two electrifying runs for the presidency in the 1980s.

Jackson’s dual bids for the Democratic presidential nomination inspired Black America and stunned political observers who marveled at his ability to draw White voters. He was a Black crossover figure long before Barack Obama hit the national stage.

Jackson first rose to national prominence in the 1960s as a close aide to the Rev. Martin Luther King Jr. After King’s assassination in 1968, Jackson became one of the most transformative civil rights leaders in America — to the chagrin of some of King’s aides, who thought he was too brash.