user: Question: Which party is Tobias A. Plants the incumbent?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Ohio 1', 'Benjamin Eggleston', 'Republican', '1864', 'Lost Re-election Democratic gain']
SQL:

assistant: SELECT "Party" FROM "Table" WHERE "Incumbent" = 'Tobias A. Plants';