Barack Obama’s 2008 presidential election proved the value and power of digital advertising in politics. And that—plus the power of ad targeting—has only grown since then. Mark Jablonowski is the managing partner and CTO of DSPolitical, an agency trading desk focused on voter file targeting for Democratic candidates and progressive causes. He spoke with eMarketer’s Lauren Fisher about the targeting tactics that are key during an election cycle as part of eMarketer’s July report, "Ad Targeting 2018: Households, Individuals or Both? Why a Blended Approach is Often the Answer."