user: Question: Who were all the candidates when incumbent was Tim Valentine?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['North Carolina 2', 'Tim Valentine', 'Democratic', 1982.0, 'Re-elected', 'Tim Valentine (D) Unopposed']
SQL:

assistant: SELECT "Candidates" FROM "Table" WHERE "Incumbent" = 'Tim Valentine';