user: Question: Who is the incumbent for the Colorado 4 district?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Results']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Colorado 1', 'Diana DeGette', 'Democratic', 1996.0, 'Re-elected']
SQL:

assistant: SELECT "Incumbent" FROM "Table" WHERE "District" = 'Colorado 4';