CREATE TABLE table_18593 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

Which incumbent was first elected in 1940?
SELECT "Incumbent" FROM table_18593 WHERE "First elected" = '1940'
SELECT "Incumbent" FROM "table_18593" WHERE "First elected" = '1940'