Claim: Democratic L. Mendel Rivers won the 1966 South Carolina 1st congressional district election where all six incumbents were re-elected.
Evidence: South Carolina 1 L. Mendel Rivers Democratic Incumbent re-elected. South Carolina 2 Incumbent re-elected. South Carolina 3 Incumbent re-elected. South Carolina 4 Incumbent re-elected. South Carolina 5 Incumbent re-elected. South Carolina 6 Incumbent re-elected.