user: Question: Who is the incumbent of district PA-8?
Columns: ['District', 'Incumbent', 'Cook', 'Rothenberg', 'CQ Politics', 'Crystal Ball']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['AL-2', '(Everett) (R)', 'Tossup', 'Pure Tossup', 'No Clear Favorite', 'Republican Hold']
SQL:

assistant: SELECT "Incumbent" FROM "Table" WHERE "District" = 'PA-8';