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_15929156_3 (mccain__percentage VARCHAR, county VARCHAR)

### Question ###
Name the mccain % for dukes

### Accurate SQL ###

SELECT mccain__percentage FROM table_15929156_3 WHERE county = "Dukes"