New mobile apps enable canvassers to door-knock more quickly, and survey voter sentiment instantly
If TV and radio ads aim to persuade the masses, phone banks and door-knockers provide a more personal touch to campaigns. This year, new digital technologies are taking that kind of voter targeting to another level -- one that some people might find a little too close for comfort. But will it make a difference in the election's outcome? Reporter: Aarti Shahani
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