user: Question:  what's the election date where electorate is Omata
Columns: ['Member', 'Electorate', 'Province', 'MPs term', 'Election date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['John Cuff Category:Articles with hCards', 'Akaroa', 'Canterbury', 'First', '28 Cannot handle non-empty timestamp argument!']
SQL:

assistant: SELECT "Election date" FROM "Table" WHERE "Electorate" = 'Omata';