The political advertising landscape has changed dramatically in recent years, these days often seeming to evolve on a daily basis. Demographics are constantly shifting, as are audience media preferences and attention spans.
There was once a (primitive) time when TV reigned supreme. It was also time during which it was difficult to track the effectiveness of ad buys, and the proposition of advertising was incredibly expensive - putting it out of the reach of many campaigns.
Things have changed drastically with rise of digital advertising.