user: Question: Who are the candidates for district Virginia 12?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Virginia 3', 'Henry St. George Tucker', 'Democratic-Republican', '1815', 'Retired Democratic-Republican hold', 'Jared Williams (DR) 64.6% John Smith (DR) 35.4%']
SQL:

assistant: SELECT "Candidates" FROM "Table" WHERE "District" = 'Virginia 12';