CREATE TABLE table_18437 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

When was Dale Alford first elected in the Arkansas 5 district?
SELECT "First elected" FROM table_18437 WHERE "District" = 'Arkansas 5'
SELECT "First elected" FROM "table_18437" WHERE "District" = 'Arkansas 5'