user: Question: Who is the incumbent that has been in office since before 1996 and was again Re-elected?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Results']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Iowa 1', 'Jim Nussle', 'Republican', 1990.0, 'Retired to run for Governor Democratic gain']
SQL:

assistant: SELECT "Incumbent" FROM "Table" WHERE "Results" = 'Re-elected' AND "First elected" < 1996.0;