"In his brilliant 2011 book The Ethics of Voting...Georgetown…

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http://reason.com/archives/2012/10/03/your-vote-doesnt-count
"In his brilliant 2011 book The Ethics of Voting...Georgetown University philosopher Jason Brennan [calculates that] the expected value of a vote...is $4.77 x 10 to the −2,650th power. That’s 2,648 orders of magnitude less than a penny.

It’s not hard to beat that offer. Say you plan to sleep for an extra hour instead of voting. Unless you are astonishingly well rested, an hour of sleep is almost certainly worth more to you than an infinitesimal fragment of a penny. Or say you plan to use that time to write an election-related blog post. The expected social payoff of even the lowest-traffic blog post is higher than the payoff from voting. In fact, an alternative activity plan isn’t even necessary: Simply not driving to the polls slightly reduces the chance that you or someone else will die in a car accident on Election Day, which is worth more than your vote can ever hope to be."