SCHEMA:
CREATE TABLE STUDENT (LName VARCHAR, StuID VARCHAR); CREATE TABLE VOTING_RECORD (CLASS_President_VOTE VARCHAR)
USER:
Find the distinct last names of the students who have class president votes.

QUERY:
SELECT DISTINCT T1.LName FROM STUDENT AS T1 JOIN VOTING_RECORD AS T2 ON T1.StuID = T2.CLASS_President_VOTE