user: Question: What is Incumbent, when Results is "Re-elected", when Party is "Democratic", and when District is "Minnesota 7"?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Results']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Minnesota 1', 'Gil Gutknecht', 'Republican', 1994.0, 'Lost re-election Democratic gain']
SQL:

assistant: SELECT "Incumbent" FROM "Table" WHERE "Results" = 'Re-elected' AND "Party" = 'Democratic' AND "District" = 'Minnesota 7';