CREATE TABLE table_18423 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

How many districts represented Edwin E. Willis?
SELECT COUNT("District") FROM table_18423 WHERE "Incumbent" = 'Edwin E. Willis'
SELECT COUNT("District") FROM "table_18423" WHERE "Incumbent" = 'Edwin E. Willis'