The 1964 Democratic National Convention was controversial because of the dispute as to which delegates from Mississippi were entitled to be present and to vote . At the national convention , the integrated Mississippi Freedom Democratic Party ( MFDP ) claimed the seats for delegates for Mississippi , on the grounds that the official Mississippi delegation had been elected in violation of the party 's rules , as it excluded blacks from voting . Blacks were still systematically excluded by discriminatory provisions from registering and voting in the primaries , and participating in the precinct and county caucuses and the state convention . Nevertheless , the MFDP delegates had all been elected in strict compliance with party rules
1964 Democratic National Convention
1964 Democratic National Convention
White primaries