user: Question: Who was the incumbent when the candidates were John Banks (AM) 52.2% Samuel Power (J) 47.8%?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Pennsylvania 1', 'Joel B. Sutherland', 'Jacksonian', '1826', 'Re-elected', 'Joel B. Sutherland (J) 61.7% James Gowen (?) 38.3%']
SQL:

assistant: SELECT "Incumbent" FROM "Table" WHERE "Candidates" = 'John Banks (AM) 52.2% Samuel Power (J) 47.8%';