Basically for me it's voting for the whore that I detest a little less. The "whore" relates to both the candidate and their party. Neither party really represents me, my values or my interests any more. Both parties platforms should have a sign that says "For Sale to the highest bidder". And the candidates who end up running for major political office are basically bought and sold to their party and the interest groups.
If you think differently I have a bridge that you might be interested in..