CREATE TABLE table_18218 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "Elected" FLOAT, "Status" TEXT, "Opponent" TEXT)

In how many districts was the democratic incumbent elected in 1974?
SELECT COUNT("District") FROM table_18218 WHERE "Party" = 'Democratic' AND "Elected" = '1974'
SELECT COUNT("District") FROM "table_18218" WHERE "Elected" = '1974' AND "Party" = 'Democratic'