What did the senators and representatives who signed the Southern Manifesto believed?
They wanted to preserve segregation
The Southern manifesto aimed at defending racial segregation and denounced racial inegration. The manifesto was signed by 101 politicians (99 Southern Democrats and two Republicans) from Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, North Carolina, South Carolina, Tennessee, Texas, and Virginia. The manifesto was signed by 19 Senators and 82 Representatives, including the entire congressional delegations of the states of Alabama, Arkansas, Georgia, Louisiana, Mississippi, South Carolina and Virginia. It included 99 Southern Democrats and two Virginia Republicans.
They denounced what they called the "clear abuse of judicial power" and suggested that the tenth amendment of the Constitution should limit the power of the Supreme Court on such issues. They promised to use "all lawful means to bring about a reversal of this decision which is contrary to the Constitution and to prevent the use of force in its implementation."