Lois Beckett writes at ProPublica:
Curious how many Democrats live on your block? Just download the Obama campaign's new mobile app .
The app, released last week, includes a Google map for canvassers that recognizes your current location and marks nearby Democratic households with small blue flags.
For each targeted address, the app displays the first name, age and gender of the voter or voters who live there: "Lori C., 58 F, Democrat."
All this is public information, which campaigns have long given to volunteers. But you no longer have to schedule a visit to a field office and wait for a staffer to hand you a clipboard and a printed-out list of addresses.
With the Obama app, getting a glimpse of your neighbor's political affiliation can take seconds.
While The New York Times dubbed  the app "the science-fiction dream of political operatives," some of the voters who appear in the app are less enthusiastic about it.
"I do think it's something useful for them, but it's also creepy," said Lori Carena, 58, a long-time Brooklyn resident, when she was shown the app. "My neighbors across the street can know that I'm a Democrat. I'm not sure I like that."
It's unclear if the app displays all registered Democrats who live in a certain area, or only a subset of voters President Obama's campaign is trying to reach.