How many distinct delegates are from counties with population larger than 50000?
SELECT count(DISTINCT T2.Delegate) FROM county AS T1 JOIN election AS T2 ON T1.County_id  =  T2.District WHERE T1.Population  >  50000
SELECT count(DISTINCT T2.Delegate) FROM county AS T1 JOIN election AS T2 ON T1.County_id  =  T2.District WHERE T1.Population  >  50000
[{'count(DISTINCT T2.Delegate)': 5}]