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

### Instruction:
Name the least valid poll for munster

### Inputs:
table_name: table, columns: ['Constituency', 'Electorate', 'Turnout', 'Spoilt', 'Valid Poll', 'Quota', 'Seats', 'Candidates']

### Response:
SELECT MIN Valid Poll FROM table WHERE Constituency = munster