Your question has nothing to do with the description on the thread opener. 
Anyway, I think there is no way to reveal the data of how many politicians having casinos. If it is in my country, the politician must be ashamed if people know it. So, they must make it very secretly. Since it is probably a secret data, we will never know the valid numbers of the politicians who runs the casinos. However, I'm not sure if there are many of them because casinos aren't popular business among them. They may prefer something that are more familiar such as properties, lands, gold, or crypto coins.