<< If you're a Republican primary voter living within 100 miles of Ames, Iowa, there's a pretty good chance that Michele Bachmann spent the summer talking to you out of your computer.

<< But only if you're a Republican primary voter.

<< While Democratic or independent Iowans saw ads for cellphones or toothpaste as they loaded up local news clips, television shows on Hulu or college football highlights, likely caucus-goers got 15 or 30 seconds of Bachmann talking about her Waterloo heritage.

<< On YouTube, ads can be targeted based on either category -- news, politics, entertainment -- or geography, by city or ZIP code. But Bachmann's campaign says it was able to target much more narrowly, cross-referencing Internet user data, gathered by programs called "cookies, with voter files that have long directed mail, phone, and door-knocking efforts." >>

Source:
http://www.politico.com/news/stories/0811/62339.html

That's impressive and a little scary. I understand that cookies can be used to determine that a particular anonymous computer user is likely to be interested in certain subjects, but I don't understand how the Bachmann campaign was able to connect anonymous computers to particular voters.