“In The Ethics of Voting, I argue that citizens have no standing moral obligation to vote. Voting is just one of many ways one can pay a debt to society, serve other citizens, promote the common good, exercise civic virtue, and avoid free-riding off the efforts of others. Participating in politics is nothing special, morally speaking.
However, I argue that if citizens do decide to vote, they have very strict moral obligations regarding how they vote. I argue that citizens must vote for what they justifiedly believe will promote the common good, or otherwise they must abstain.
That is, voters should vote on the basis of sound evidence. They must put in heavy work to make sure their reasons for voting as they do are morally and epistemically justified. In general, they must vote for the common good rather than for narrow self-interest. Citizens who are unwilling or unable to put in the hard work of becoming good voters should not vote at all. They should stay home on election day rather than pollute the polls with their bad votes.
bonus: The Ethics of Voting – Princeton University Press – Introduction