CREATE TABLE table_18400 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Who was the candidate when the incumbent was Richard C. White?
SELECT "Candidates" FROM table_18400 WHERE "Incumbent" = 'Richard C. White'
SELECT "Candidates" FROM "table_18400" WHERE "Incumbent" = 'Richard C. White'