CREATE TABLE table_18588 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

In what year was Leo E. Allen first elected?
SELECT "First elected" FROM table_18588 WHERE "Incumbent" = 'Leo E. Allen'
SELECT "First elected" FROM "table_18588" WHERE "Incumbent" = 'Leo E. Allen'