We knew nearly nothing, except that the Secret Service had intercepted “potential explosive devices” targeting the Clintons and Obamas, while investigators also looked into a suspicious package at CNN’s New York offices. Days earlier, authorities found an explosive device in the mailbox of liberal philanthropist George Soros. We did not know who sent them, or why, or what exactly the potential devices were. But John Cardillo, a right-wing media personality, was already tweeting out his suspicions. “Investigators need to take a serious look at far left groups like #Antifa when investigating the bombs sent to Soros, Obama, and the Clintons,”...