CREATE TABLE table_18548 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

How many times was william m. colmer winstead first elected?
SELECT COUNT("First elected") FROM table_18548 WHERE "Incumbent" = 'William M. Colmer'
SELECT COUNT("First elected") FROM "table_18548" WHERE "Incumbent" = 'William M. Colmer'