user: Question: Who were the running candidates when Samuel Riker was the incumbent?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['New York 1', 'Samuel Riker', 'Democratic-Republican', 1806.0, 'Retired Democratic-Republican hold', 'Ebenezer Sage (DR) 93.5% David Gardiner (F) 6.5%']
SQL:

assistant: SELECT "Candidates" FROM "Table" WHERE "Incumbent" = 'Samuel Riker';