It is prohibited sighting a politician or any government officials gambling in my country especially in a public space , its an eye saw, as in what message are you trying to convey to your subject or to the public that you are a gambler, an addicted gambler that you aren't responsible, it show or tells so many negative impressions about you, it doesn't speaks good about you as a person rather it leaves many with the impression that you just gonna divert the nation funds on gambling someday.
Ordinarily, the thought of diverting the national funds to gambling is the major reason why this is a big issue, else, a government official is a human like any other person, except in a city where gambling is banned and it's a crime to be caught doing it.
Saying that to see a government official gambling in an open space is an eye saw, leaves me wondering if gambling is a bad thing, are you not trying to paint gambling exactly the way our parents painted it where the assumed that any body who gambles is an irresponsible person which I believe you know is not totally true, as irresponsibility as a result of gambling is an individual thing.
So, like I've said before, the only reason it's very bad for a government official to be seen gambling is that people will have the impression that he or she is going to embezzle public fund to use for gambling, outside of this, a government official is still a humans with feelings as every one else in that same country.