Those who think that politicians should be held to a higher moral standard than other influential people seem guilty of an inconsistency. The primary clue as to what should be expected of you is in your job title or description – if you’re a teacher, you should be judged on your teaching, and if you’re a President, you should be judged on how well you preside.
I realise that this is a simplification, in that it is sometimes the case that other factors should influence our assessment of your suitability for a role. But we would typically require some clear link between your “crime” and the job you are employed to perform.