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_21531764_2 (senior_us_senator VARCHAR, governor VARCHAR)

### Question ###
Who was the senior US senator in the state whose governor was D. Patrick?

### Accurate SQL ###

SELECT senior_us_senator FROM table_21531764_2 WHERE governor = "D. Patrick"