user: Question: Who is the incumbent candidate in the election of Percy Priest (D) 90.8% Robert M. Donihi (R) 9.2%?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Tennessee 4', 'Joe L. Evins', 'Democratic', 1946.0, 'Re-elected', 'Joe L. Evins (D) Unopposed']
SQL:

assistant: SELECT "Incumbent" FROM "Table" WHERE "Candidates" = 'Percy Priest (D) 90.8% Robert M. Donihi (R) 9.2%';