If YOU can't make up your mind, then just don't vote. Seriously. You can get Approval Voting and just not even show up and vote. You'll still get massively better election outcomes because of all the people who do show up to vote are using an objectively better decision-making algorithm. Yes, objectively better.
An honest vote in first-past-the-post, say for your awesome friend Bob for President, would give you approximately 0% return compared to the proper strategy of voting for the lesser evil of Clinton.
Explained here with a simple graphic to visualize it. www.electology.org/topic/tactical-voting
The optimal strategy on who to vote for depends not only on preferences, but also on what you know about the other voters. Polls help here.
The nice thing about approval voting is that, even though their might not be one single, clear and obvious way to translate your preference into your vote; but there is a clear and obvious family of ways to do so. And they have nice properties.
In-first-past-the-post, people often elect to give their vote to the lesser evil, instead of their preferred (third-party) candidate.
In approval voting, you will never have to give a compromise candidate more `vote' than any other candidate you prefer.
Ie all families of sensible voting strategies for approval voting look like this:
- sort candidates in order of preference - figure out a cutoff - approve anyone above the cutoff
The optimal cutoff depends on the peculiarities of the election (polls etc).
In practice, people manage this quite well intuitively. (I have run approval votings for small things, like which restaurant to take the team to.)
This works out well, tending to elect Condorcet winners. http://ScoreVoting.net/AppCW.html
You must be joking? Almost no one ever votes their true preference in first-past-the-post. People usually vote for the lesser evil of the top two candidates, because any other strategy (like voting for who you'd actually like to win the election) just wastes your vote.
In any case, check out eg https://en.m.wikipedia.org/wiki/Approval_voting for other people's thoughts on the system. There's much more online about all aspects and pros and cons that we don't need to rehash.