The first and foremost Duty of a voter is to cast his vote. Let us not be guided by others who do not find any thing worthwhile in electing same dirty politicians again and again. The time has come when people should take their own decisions and stop being guided by others' opinions.
The second duty of a voter is to cast a positive vote. A voter should vote for a person on his or her merits. Voting for someone because he or she belongs to a particular religion, caste, place, language etc is a negative vote. Voting for someone simply because a voter is not happy with other candidates is also a negative vote. I prefer making my vote invalid rather than casting a negative vote.
The third duty of a voter is to express appreciation when the elected representative performs the job well. But the voter should also express dissatisfaction when the elected representative does not perform the job well. In case of undignified conduct of the elected representative the voter should express personal indignation and ask him to tender an apology. The voter should clearly tell the elected representative that his action should not embarrass the voters.