The science of swing-state canvassing

Richard Datchuk volunteers at a Mitt Romney campaign office in Columbus, Ohio.  Joel Prince, The Washington Post

Post reporters Stephanie McCrummen and Ed O'Keefe spent the weekend in Ohio, where  the Obama and Romney campaigns are deploying small armies of volunteers to knock on doors and make phone calls to sway voters.

Both campaigns said these types of voter outreach efforts are still more effective than TV ads and social media, and they are meticulous in their methods for deciding who to contact. 

Here's their story on how each campaign is squeezing every vote out of one of the biggest battleground states.  

And for comparison, here's what it looked like four years ago: 

Natalie Jennings is a Web producer for PostTV.
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