CREATE TABLE table_15144 ("Electorate" CLOB, "Incumbent" CLOB, "Winner" CLOB, "Majority" FLOAT, "Runner up" CLOB)

Who was the incumbent when Arthur Osborne won the election?
SELECT "Incumbent" FROM table_15144 WHERE "Winner" = 'arthur osborne'
SELECT "Incumbent" FROM "table_15144" WHERE "Winner" = 'arthur osborne'