CREATE TABLE table_30838 ("By-election" FLOAT, "Electorate" CLOB, "Date" CLOB, "Incumbent" CLOB, "Reason" CLOB, "Winner" CLOB)

When peninsula is the electorate what is the reason?
SELECT "Reason" FROM table_30838 WHERE "Electorate" = 'Peninsula'
SELECT "Reason" FROM "table_30838" WHERE "Electorate" = 'Peninsula'