I think the most promising canditates are Sanders and Paul, unfortunately I don't think either one will win. We will get another Clinton or Bush and the same shit will continue for at least another 4 years. Rand Paul would be the kind of Republican that would get my vote, his filibuster of the Patriot Act renewal shows that he has citizen's rights in mind. Its a sad state of affairs when Paul is so much lower on the polls than someone like Trump, but I guess that shows you how big of a circus our political system is.