Just stay home.
This is the most media-covered, most talked-about, most clearly defined election in my adult life.
We live in an age of information on demand and you haven't taken the hour or less to research the candidates and their platforms. You haven't bothered understanding how the issues relate to your own life. Unimpressive to say the least.
If you are truly undecided at this point you are the type of voter that will shoot your vote rather blindly before going back to your video games, reality TV, issues of "Us" and "Entertainment Weekly"; in other words an existence that is politically undefined. Don't cancel the vote of someone who cares enough to embrace their Constitutional freedom and be engaged in their Representative Democracy.