CREATE TABLE table_754 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

How many were first elected when the incumbent was Morgan M. Moulder?
SELECT COUNT("First elected") FROM table_754 WHERE "Incumbent" = 'Morgan M. Moulder'
SELECT COUNT("First elected") FROM "table_754" WHERE "Incumbent" = 'Morgan M. Moulder'