Not vote? You can't if you care

Say the November election is very close in your state. One million citizens vote for Mitt Romney, and 999,999 vote for Barack Obama.
    But you and your friend, disappointed and angry that President Obama's first term didn't live up to your hopes and expectations, don't vote. You stay home, you get drunk, whatever.

Are you sure you didn't vote? Romney got one more vote than Obama. You and your friend gave him that margin.
    If you care about the outcome of an election, you can't, logically, not vote.
    Caring includes taking care of your vote.
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[Follow-up]