user: Question: who are the candidates when the incumbent is Lindsey Graham?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Results', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['South Carolina 1', 'Mark Sanford', 'Republican', 1994.0, 'Retired Republican hold', 'Henry Brown (R) 60% Andy Brack (D) 36%']
SQL:

assistant: SELECT "Candidates" FROM "Table" WHERE "Incumbent" = 'Lindsey Graham';