Remember the days when political campaigns consisted of candidates sign waving, making the occasional radio or TV appearance, and going door-to-door to introduce themselves?

Platforms like Twitter and Facebook have been around long enough now to become communications staples for political hopefuls. But in an increasingly plugged-in society, candidates are finding even more ways to reach potential voters. 

Take an example from the Capitol Hill newspaper Roll Call, which describes how more and more candidates are turning to the music-streaming service Pandora. It demonstrates how new technologies can target content — even campaign ads — to certain audiences based on zip code, gender, age and other factors. 

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