CREATE TABLE table_25038 ("District" CLOB, "Vacator" CLOB, "Reason for change" CLOB, "Successor" CLOB, "Date successor seated" CLOB)

Who left a seat open for the district of connecticut at-large
SELECT "Vacator" FROM table_25038 WHERE "District" = 'Connecticut At-large'
SELECT "Vacator" FROM "table_25038" WHERE "District" = 'Connecticut At-large'