Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the election date for those politicians who left office on 1850-11-15?

### Inputs:
table_name: table, columns: ['Election number', 'Election date', 'District', 'Province', 'Took office', 'Left office']

### Response:
SELECT COUNT Election date FROM table WHERE Left office = 1850-11-15