What's the percentage of votes for Tom Horner according to the poll source that claimed 31% for Matt Entenza?
create table table_20032301_3 (tom_horner__i_ varchar, matt_entenza__dfl_ varchar, PRIMARY KEY (tom_horner__i_))
select tom_horner__i_ from table_20032301_3 where matt_entenza__dfl_ = "31%"