CREATE TABLE table_25099 ("District" TEXT, "Vacator" TEXT, "Reason for change" TEXT, "Successor" TEXT, "Date successor seated" TEXT)

What is every date successor seated for the Virginia 11th District?
SELECT "Date successor seated" FROM table_25099 WHERE "District" = 'Virginia 11th'
SELECT "Date successor seated" FROM "table_25099" WHERE "District" = 'Virginia 11th'