The Russians were coming. Did anyone listen?

Yesterday's Senate testimony by former Obama Administration officials was as much a warning about elections to come as it was about last year's campaign.  But the focus was on how former Acting Attorney General Sally Yates told the Trump White House that its National Security Advisor had been compromised. She thought action was needed, but General Michael Flynn was not fired for almost three weeks — after he'd attended high-security meetings. Democrats want an independent investigation, but President Trump still calls it "fake news."  How real is Russia's threat to democracy?