user: Question: What district does Harlan Hagen represent?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['California 1', 'Hubert B. Scudder', 'Republican', 1948.0, 'Re-elected', 'Hubert B. Scudder (R) 59.1% Max Kortum (D) 40.9%']
SQL:

assistant: SELECT "District" FROM "Table" WHERE "Incumbent" = 'Harlan Hagen';