user: Question: What party is the person who was first elected in 2000 and was Re-elected?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Results']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Michigan 1', 'Bart Stupak', 'Democratic', 1992.0, 'Re-elected']
SQL:

assistant: SELECT "Party" FROM "Table" WHERE "Results" = 'Re-elected' AND "First elected" = 2000.0;