CREATE TABLE table_18530 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

What year was incumbent barratt o'hara first elected?
SELECT "First elected" FROM table_18530 WHERE "Incumbent" = 'Barratt O''Hara'
SELECT "First elected" FROM "table_18530" WHERE "Incumbent" = 'Barratt O''Hara'