CREATE TABLE table_18442 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

How many candidates were there in the election for William Jennings Bryan Dorn's seat?
SELECT COUNT("Candidates") FROM table_18442 WHERE "Incumbent" = 'William Jennings Bryan Dorn'
SELECT COUNT("Candidates") FROM "table_18442" WHERE "Incumbent" = 'William Jennings Bryan Dorn'