How many students have president votes?
select count(distinct t1.stuid) from student as t1 join voting_record as t2 on t1.stuid = t2.president_vote
How many of them are female?
select count(distinct t1.stuid) from student as t1 join voting_record as t2 on t1.stuid = t2.president_vote where t1.sex = "F"
What are their first and last names?
select distinct t1.fname, t1.lname from student as t1 join voting_record as t2 on t1.stuid = t2.president_vote where t1.sex = "F"