A new report suggests a “sophisticated” Russian propaganda campaign helped flood social media with fake news stories leading up to the presidential election. The Washington Post, citing a yet-to-be published report from independent researchers, said the goal was to punish Hillary Clinton, help Donald Trump, and undermine faith in American democracy. The report comes from a nonpartisan group of researchers called PropOrNot. The group describes itself as “concerned American citizens” with expertise in computer science, national security and public policy. The researchers say they traced the origins of posts and mapped the connections among accounts that delivered similar messages. …