I've never yet been thrilled with the choices in a presidential election.. who has??
"Politicans, Preists and Shamans should all be considered guilty untill proven otherwise."
However; the franchise must be exercised, and if you do not vote because you do not like the candidates, then yer not deserving of the benifits gained from democracy in action.
There may be no candidates and no measures you want to vote for . . but there are certain to be ones you want to vote against. By this rule you will rarely go wrong.
If this is too blind for your taste, consult some well-meaning fool (there is always one around) and ask his advice. Then vote the other way. This enables you to be a good citizen without spending the enormous amount of time on it that truly intelligent exercise of the franchise requires.
Hang