The antidote to Landsburg's naive (and quite unoriginal) approach to voting: Valdis Krebs' "It's the Conversations, Stupid" http://www.orgnet.com/PoliticalConversations.pdf

Or for a mental exercise, figure out for yourself what is wrong with this statement (key quote from the Slate article): "Your individual vote will never matter unless the election in your state is within one vote of a dead-even tie."