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

### Instruction:
What is Party, when Results is "Re-Elected", when First Elected is greater than 1990, and when District is "Minnesota 4"?

### Inputs:
table_name: table, columns: ['District', 'Incumbent', 'Party', 'First elected', 'Results']

### Response:
SELECT Party FROM table WHERE Results = re-elected AND First elected > 1990 AND District = minnesota 4