Is Voting Your Heart Immoral and Unethical?

Many Democrats are still feeling "The Bern," and there are options to Hillary Clinton: Libertarian candidate Gary Johnson and Green Party candidate Jill Stein. Democrats voting for them would be "voting their conscience," rather than picking Clinton as the lesser of two evils. Is that really as moral a choice as it sounds? Jason Brennan is a philosopher at Georgetown University and author of The Ethics of Voting.