CREATE TABLE table_18621 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

how many party with dbeingtrict being alabama 6
SELECT COUNT("Party") FROM table_18621 WHERE "District" = 'Alabama 6'
SELECT COUNT("Party") FROM "table_18621" WHERE "District" = 'Alabama 6'