CREATE TABLE VOTING_RECORD (CLASS_President_VOTE VARCHAR)
CREATE TABLE STUDENT (LName VARCHAR, StuID VARCHAR)

Find the distinct last names of the students who have class president votes.
SELECT DISTINCT T1.LName FROM STUDENT AS T1 JOIN VOTING_RECORD AS T2 ON T1.StuID = T2.CLASS_President_VOTE
SELECT DISTINCT "T1"."LName" FROM "STUDENT" AS "T1" JOIN "VOTING_RECORD" AS "T2" ON "T1"."StuID" = "T2"."CLASS_President_VOTE"