Question: Name the candidates for L. Mendel Rivers
SQL: SELECT COUNT("Candidates") FROM "1-1341897-42" WHERE "Incumbent" = 'L. Mendel Rivers';

Question: Name the result for South Carolina 4
SQL: SELECT "Result" FROM "1-1341897-42" WHERE "District" = 'South Carolina 4';

Question: Name the candidates for South Carolina 3
SQL: SELECT "Candidates" FROM "1-1341897-42" WHERE "District" = 'South Carolina 3';

Question: Name the incumbent for first elected 1956
SQL: SELECT "Incumbent" FROM "1-1341897-42" WHERE "First elected" = 1956.0;