user: Question: Name the successor for Election was successfully contested July 30, 1861
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Colorado Territory At-large', 'New seat', 'New seat', 'Hiram P. Bennett (Conservative R)', 'August 19, 1861']
SQL:

assistant: SELECT "Successor" FROM "Table" WHERE "Reason for change" = 'Election was successfully contested July 30, 1861';