user: Question: In the Ohio 4 district, that is the first elected date that has a result of Re-elected?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Ohio 1', 'Benjamin Eggleston', 'Republican', 1864.0, 'Re-elected']
SQL:

assistant: SELECT "First elected" FROM "Table" WHERE "Result" = 'Re-elected' AND "District" = 'Ohio 4';