CREATE TABLE table_name_52 (first_elected VARCHAR2, results VARCHAR2, party VARCHAR2)

In what year did the Democratic incumbent that was re-elected first take office?
SELECT first_elected FROM table_name_52 WHERE results = "re-elected" AND party = "democratic"
SELECT "first_elected" FROM "table_name_52" WHERE "democratic" = "party" AND "re-elected" = "results"