Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_20683381_2 ( date_of_opinion_poll VARCHAR, undecided VARCHAR )

### Question ###
How many polls taken on different dates show an undecided percentage of 25%?

### Accurate SQL ###

SELECT COUNT(date_of_opinion_poll) FROM table_20683381_2 WHERE undecided = "25%"