user: Question: What is the highest First Elected, when Results is "Re-elected", and when Incumbent is "Lincoln Davis"?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Results']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Tennessee 1', 'William L. Jenkins', 'Republican', 1996.0, 'Retired Republican hold']
SQL:

assistant: SELECT MAX("First elected") FROM "Table" WHERE "Results" = 'Re-elected' AND "Incumbent" = 'Lincoln Davis';