user: Question: What party does the incumbent from the Ohio 20 district belong to? 
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Ohio 2', 'William E. Hess', 'Republican', 1938.0, 'Lost re-election Democratic gain', 'Earl T. Wagner (D) 52.8% William E. Hess (R) 47.2%']
SQL:

assistant: SELECT "Party" FROM "Table" WHERE "District" = 'Ohio 20';