CREATE TABLE table_18466 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

What is the number of party in the arkansas 1 district
SELECT COUNT("Party") FROM table_18466 WHERE "District" = 'Arkansas 1'
SELECT COUNT("Party") FROM "table_18466" WHERE "District" = 'Arkansas 1'