CREATE TABLE table_18460 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

Name the candidates for l. mendel rivers
SELECT COUNT("Candidates") FROM table_18460 WHERE "Incumbent" = 'L. Mendel Rivers'
SELECT COUNT("Candidates") FROM "table_18460" WHERE "Incumbent" = 'L. Mendel Rivers'