The following year, CORE along with the Student Nonviolent Coordinating Committee (SNCC) and the National Association for the Advancement of Colored People (NAACP) helped organize the "Freedom Summer" campaign - aimed principally at ending the political disenfranchisement of African Americans in the Deep South. Operating under the umbrella coalition of the Council of Federated Organizations (COFO), volunteers from the three organizations concentrated their efforts in Mississippi. In 1962 only 6.7 percent of African Americans in the state were registered to vote, the lowest percentage in the country. This involved the formation of the Mississippi Freedom Democratic Party (MFDP). Over 80,000 people joined the party and 68 delegates attended the Democratic Party Convention in Atlantic City and challenged the attendance of the all-white Mississippi representation.