Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_12873 ( "District" text, "Incumbent" text, "Party" text, "First elected" real, "Results" text )

### Question ###
In what year did the Democratic incumbent that was re-elected first take office?

### Accurate SQL ###

SELECT "First elected" FROM table_12873 WHERE "Results" = 're-elected' AND "Party" = 'democratic'