CREATE TABLE table_18407 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

how many party with district being tennessee 1
SELECT COUNT("Party") FROM table_18407 WHERE "District" = 'Tennessee 1'
SELECT COUNT("Party") FROM "table_18407" WHERE "District" = 'Tennessee 1'