What are the distinct last names of the students who have president votes but do not have 2192 as the advisor?
SELECT DISTINCT T1.LName FROM STUDENT AS T1 JOIN VOTING_RECORD AS T2 ON T1.StuID  =  PRESIDENT_Vote EXCEPT SELECT DISTINCT LName FROM STUDENT WHERE Advisor  =  "2192"
Başkan oyu veren ancak danışman olarak 2192'si olmayan öğrencilerin farklı soyadı nelerdir?