All three ex-presidents paid tribute to Jackson and shared personal stories.
According to the AP, Obama said that Jackson's attempt to become the Democratic presidential candidate in the 1980s was an inspiration to both him and other Black politicians.
He paved the way for so many others, said Obama, who took office as the first Black president of the United States in 2009.
Jesse Jackson became a well-known figure during the civil rights movement of the 1960s. He participated in the 1965 Selma-Montgomery march for Black voting rights, alongside civil rights activist Martin Luther King.
Jackson passed away on February 17, at age 84.
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