CREATE TABLE table_18585 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

How many parties does incumbent carl vinson represent?
SELECT COUNT("Party") FROM table_18585 WHERE "Incumbent" = 'Carl Vinson'
SELECT COUNT("Party") FROM "table_18585" WHERE "Incumbent" = 'Carl Vinson'