CREATE TABLE table_28587 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "Elected" FLOAT, "Status" TEXT, "Result" TEXT)

how many party classifications are there for the incumbent Mac Collins?
SELECT COUNT("Party") FROM table_28587 WHERE "Incumbent" = 'Mac Collins'
SELECT COUNT("Party") FROM "table_28587" WHERE "Incumbent" = 'Mac Collins'