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_name_68 (democratic_ticket VARCHAR, office VARCHAR)

### Question ###
The person who is on the Democratic ticket for the position of Office of U.S. Senator was who?

### Accurate SQL ###

SELECT democratic_ticket FROM table_name_68 WHERE office = "u.s. senator"