The Democratic National Convention has played a significant role in Black history in the United States. One of the most notable moments was during the 1964 Democratic National Convention held in Atlantic City, New Jersey. This convention marked a turning point in the Civil Rights Movement as the Mississippi Freedom Democratic Party, a group composed of Black activists and leaders, challenged the all-white official delegation from Mississippi.

The MFDP, led by civil rights activists Fannie Lou Hamer and Ella Baker, demanded representation and an end to the exclusion of Black voters in the South. Their challenge brought national attention to the issue of racial discrimination within the Democratic Party and led to important reforms in the party's selection process and platform. While the MFDP's challenge was not successful at the 1964 convention, it laid the groundwork for future progress in the fight for racial equality within the Democratic Party.

Overall, the Democratic National Convention has served as a platform for Black politicians, activists, and voters to advocate for civil rights, equality, and representation within the party and in American society as a whole.