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mysql> desc poll;
+-------+------------------+------+-----+---------+----------------+
...
| id    | int(10) unsigned |      | PRI | 0       | auto_increment |
| poll  | varchar(50)      |      |     |         |                |
+-------+------------------+------+-----+---------+----------------+

mysql> desc poll_votes;
+---------+------------------+------+-----+---------+----------------+
...
| poll_id | int(10) unsigned |      |     | 0       |                |
| address | varchar(50)      |      |     |         |                |
+---------+------------------+------+-----+---------+----------------+

mysql> select * from poll;
+----+--------+
...
|  2 |       2 | junk     |
|  3 |       2 | morejunk |
+----+---------+----------+

         select p.poll 
           from poll p 
left outer join poll_votes pv 
             on pv.poll_id=p.id and pv.address='junk' 
          where pv.poll_id is null;

+------+
| poll |
...
| C    |
| C++  |
+------+