user: Question: Name the first elected for Abner J. Mikva
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Illinois 2', 'Morgan F. Murphy', 'Democratic', 1970.0, 'Re-elected', 'Morgan F. Murphy (D) 84.7% Spencer Leak (R) 15.3%']
SQL:

assistant: SELECT "First elected" FROM "Table" WHERE "Incumbent" = 'Abner J. Mikva';