The usual advice when you can't decide which candidate will get your vote is to chose the lesser of two evils - vote for the candidate that you dislike the least. Some people will vote for a third party candidate. I even read an article advising people to vote for Trump so Clinton will not win by the huge margin that is expected. Supposedly, a narrow victory instead of a landslide will let Mrs. Clinton know she doesn't have the support she thought she had. That last tactic seems pretty impossible to pull off, and I think it could be the suggestion of a Trump-ist attempting to grab some of Hillary's votes.
I think that the "lesser of two evils" approach is wrong for the 2016 presidential election. I refuse to choose between a nut and a prevaricator. Casting a third party vote is something I considered, but decided against. My solution will be to skip casting a vote for president. My hope is that every undecided voter, every constituent who plans to go with a third party, every member of the electorate who deplores this impossible choice we've been handed will simply refuse to play along. If enough people abstain, the election statistics will deliver the message.
There is a ballot option known as "None of the Above" or
NOTA. It allows voters to indicate disapproval of all candidates.
NOTA is standard voting procedure in India, Greece, Ukraine, Spain, Colombia, Bangladesh,
and the U. S. state of Nevada. If the
NOTA option receives the highest number of votes, there are a number of solutions - leaving the office vacant, filling the post by appointment, reopening nominations, or holding another election. In Nevada, if the highest number of votes cast are for "None of the Above," the second runner up wins the election. In this case, a
NOTA vote doesn't have a bearing on an election's results, but official numbers send a message.
If you think a "None of the Above" vote is an option you would like to have, contact your state and federal representatives.
UPDATE: On December 14, 2016, the Washington Post reported that 1.7 million people in 33 states skipped voting for a presidential candidate in the 2016 election. That's 2% of all voters. It's also twice as many as in 2012.