From
Tim Morrissey:
Your simple act of voting sends a message far stronger than just determining which candidate will win. Voting scares the hell out of a lot of politicians, whose job security depends on hordes of voters not caring enough to vote.
My father often told me that voting lets the politicians know we're watching them.
If you don't like any of your choices, write someone in. Staying home is not an effective protest; it just tells our representatives that they can count on you staying out of the process.