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

### Instruction:
Who left a seat open for the district of connecticut at-large

### Inputs:
table_name: table, columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']

### Response:
SELECT Vacator FROM table WHERE District = Connecticut At-large