Democratic candidates are trying to find a new way to compete with Republicans on social media, but they still seem to be missing a vital piece of the puzzle. Former Obama campaign manager David Plouffe recently wrote an opinion column for The New York Times with the headline, “The Old Way of Campaigning Won’t Cut It Anymore.” In it, he details what exactly the Democratic Party needs to be doing differently ? showcasing candidates with an in-house content creation arm that is as robust as other areas of the campaign. “To win today, you need to harmonize your message across...