CREATE TABLE table_18476 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Name all the candidates listed in the race where the incumbent is Prince Hulon Preston, Jr.
SELECT "Candidates" FROM table_18476 WHERE "Incumbent" = 'Prince Hulon Preston, Jr.'
SELECT "Candidates" FROM "table_18476" WHERE "Incumbent" = 'Prince Hulon Preston, Jr.'