Credit: Martin O’Neill

If you're a Democrat (although Republicans will have similar experiences), don't be surprised if a canvasser knocks on your door in 2012 and, glancing at his iPhone, says, "Ms. Smith, thanks for your $50 donation four years ago--and for attending the Joneses' party on the environment. Care to call voters in Ohio to help reëlect President Obama? Oh, and your neighbor Mrs. Jensen couldn't get to the polls in 2008. Think you could give her a lift on Election Day?"

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