user: Question: How much First elected has a Result of re-elected, and a Party of republican, and a District of illinois 4?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Illinois 1', 'Elihu B. Washburne', 'Republican', 1852.0, 'Re-elected']
SQL:

assistant: SELECT "First elected" FROM "Table" WHERE "Result" = 're-elected' AND "Party" = 'republican' AND "District" = 'illinois 4';