I believe that it is important that any government official let the voters know if he/she holds dual citizenship from any other state. I’m glad to know that Bernie is not a dual citizen, but it is a question that should be asked of every official. Dual citizenship is by definition a dual loyalty issue. I remember when Michele Bachmann decided to apply for Swiss citizenship.
I would never vote for a dog catcher who was a dual citizen by choice. If a person is considered a citizen by his parents’ country of origin when he hasn’t requested it, and never acted on it is a different issue, but if a Jew travels to Israel and claims Israeli citizenship, that person shouldn’t be elected.