CREATE TABLE table_72409 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

How many were first elected in the Arkansas 4 district?
SELECT COUNT("First elected") FROM table_72409 WHERE "District" = 'Arkansas 4'
SELECT COUNT("First elected") FROM "table_72409" WHERE "District" = 'Arkansas 4'