user: Question: When was the incumbent Sherrod Brown first elected? 
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Results', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Ohio 1', 'Steve Chabot', 'Republican', 1994.0, 'Re-elected', 'Steve Chabot (R) 53% Roxanne Qualls (D) 47%']
SQL:

assistant: SELECT "First elected" FROM "Table" WHERE "Incumbent" = 'Sherrod Brown';