Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_224844_4 (reason_for_change VARCHAR, district VARCHAR)

### Question ###
Why was a seat left open fo Connecticut at-large?

### Accurate SQL ###

SELECT reason_for_change FROM table_224844_4 WHERE district = "Connecticut At-large"