what was his opposition rate
SELECT t2.oppose_rate FROM people AS t1 JOIN candidate AS t2 ON t1.people_id   =   t2.people_id where t1.name  =  "Vincent Montméat"
his opposition rate refers to t2.oppose_rate; opposition rate of a person named 'Vincent Montméat' is found by JOINing tables on a common identifier (people_id) and filtering where t1.name = 'Vincent Montméat';