CREATE TABLE table_18556 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Who is the candidate for the district Arkansas 2?
SELECT "Candidates" FROM table_18556 WHERE "District" = 'Arkansas 2'
SELECT "Candidates" FROM "table_18556" WHERE "District" = 'Arkansas 2'