user: Question: Who is the incumbent that is a Republican and first elected before 1864?
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 "Incumbent" FROM "Table" WHERE "Party" = 'Republican' AND "First elected" < 1864.0;