Re: To all Americans
Don't be afraid to vote for the least worst candidate.
Or if you are into tactical voting, the least worst that is capable of winning.
But imho voting is more effective most times than not voting. If you are a part of a small minority that "spoil" their papers (in the absence of a "none of the above") you'll get classified by most people as a group that gets described as cranks, anarchists, and too-stupid-to-even-mark-a-box-correctly.
Protest at the candidates by writing to the newspaper, posting on facebook, etc where your thoughts will be read - only polling officials and candidate representatives will see what you write on the ballot paper.